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TIDAL POWER

Abstract

Renewable energy can be used to decrease global dependence on natural resources, and tidal power can be the primary form of renewable power utilized. Built upon steam turbine knowledge, tidal turbines draw on innovative technology and design to operate on both the inflow and outflow of water through them. Two case studies, Annapolis Royal and La Rance, prove that tidal power plants are capable of producing reliable and efficient power. Problems, such as initial cost and power transportation hinder future implementation of tidal power plants. This paper emphasizes the possibilities of utilizing the power of the oceans by pollution free, tidal Power generation. Tidal power utilizes twice the daily variation in sea level caused primarily by the gravitational effect of the Moon and, to a lesser extent by the Sun on the world's oceans. The Earth's rotation is also a factor in the production of tides.

INTRODUCTION

The sources for 90% of the electric energy generated today are non-renewable. Natural resource emissions are over 120 times greater than that of renewable emissions. The depletion of the finite resources, environmental pollution, global warming became more apparent near the end of the 20th century. World energy consumption is expected to rise 60 per cent by 2020. In order to meet that demand, while limiting production of green house gases, renewable energy sources considered as an alternative to traditional forms of energy production.

Renewable sources of energy are necessary because the Earth will eventually run out of the resources to create non-renewable energy. There are three types of renewable energy sources: solar, wind, and waterpower. Both solar and wind power are drastically affected by weather variations, while tidal power varies little when the weather changes power. Over the last fifty years, engineers have begun to look at tidal and wave power on a larger, industrial scale. However, until the last few years, wave power and tidal power were both seen as uneconomic. Although some pilot projects showed that energy could be generated, they also showed that, even if cost of the energy generated was not considered, there was a real problem making equipment which could withstand the extremely harsh marine environment.

Tidal energy is an essentially renewable resource which has none of the typical environmental impacts of other traditional sources of electricity such as fossil fuels or nuclear power. Changing the tidal flow in a coastal region could, however, result in a wide variety of impacts on aquatic life, most of which are poorly understood. Tidal power works because of the Moon’s constant rotation around the Earth. This is very convenient because scientist’s can predict the electricity production on a daily basis. .

The tides produce the electricity for tidal power by flowing in and out of turbines. A hydrostatic head or adequate water height difference on either side of the turbine. The simple idea of utilizing hydrostatic head to power turbines will be the crux of our article.

Using the Energy of the Ocean:

There are three basic ways to tap the ocean for its energy.

We can use the ocean's waves,

we can use the ocean's high and low tides, or

We can use temperature differences in the water.

Let’s take a look at each,

Wave energy

Kinetic energy (movement) exists in the moving waves of the ocean. That energy can be used to power a turbine. In this simple example, to the right, the wave rises into a chamber. The rising water forces the air out of the chamber. The moving air spins a turbine which can turn a generator. When the wave goes down, air flows through the turbine and back into the chamber through doors that are normally closed. This is only one type of wave-energy system. Others actually use the up and down motion of the wave to power a piston that moves up and down inside a cylinder. That piston can also turn a generator. Most wave-energy systems are very small. But, they can be used to power a warning buoy or a small light house.

Tidal Energy

Another form of ocean energy is called tidal energy. When a tide comes into the shore, they can be trapped in reservoirs behind dams. Then when the tide drops, the water behind the dam can be let out just like in a regular hydroelectric power plant.

In order for this to work well, you need large increases in tides. An increase of at least 16 feet between low tide to high tide is needed. There are only a few places where this tide change occurs around the earth. Some power plants are already operating using this idea. One plant in France makes enough energy from tides to power 240,000 homes.

Ocean Thermal Energy

The final ocean energy idea uses temperature differences in the ocean. If you ever went swimming in the ocean and dove deep below the surface, you would have noticed that the water gets colder the deeper you go. It's warmer on the surface because sunlight warms the water. But below the surface, the ocean gets very cold. That's why scuba divers wear wet suits trapped their body heat to keep them warm. Power plants can be built that use this difference in temperature to make energy. A difference of at least 38 degrees Fahrenheit is needed between the warmer surface water and the colder deep ocean water. Using this type of energy source is called Ocean Thermal Energy Conversion or OTEC. It is being used in both Japan and in Hawaii in some demonstration projects.

WAVE ENERGY

Wave Power I - sea-based devices

A recent review has shown that there are new types of wave power devices which can produce electricity economically. The “Salter” Duck is the device which can produce electricity for lower cost. `The “Salter” Duck was developed in the 1970s by Professor Stephen Salter at the University of Edinburgh in Scotland and generates electricity by bobbing up and down with the waves. Although it can produce energy extremely efficiently it was effectively killed off in the mid 1980s when a European Union report miscalculated the cost of the electricity it produced by a factor of 10. In the last few years, the error has been realized, and interest in the Duck is becoming intense.

The “Clam” is another device which, like the “Salter” Duck can make energy from sea swell. The Clam is an arrangement of six airbags mounted around a hollow circular spine. As waves impact on the structure air is forced between the six bags via the hollow spine which is equipped with self-rectifying turbines. Even allowing for cabling to shore, it is calculated that the Clam can produce energy for around $US0.06kW/hr.

Wave Power II- Shore based systems

Where the shoreline has suitable topography, cliff-mounted oscillating water column (OWC) generators can be installed. OWC systems have a number of advantages over the Clam and the Duck, not the least of which is the fact that generators and all cabling are shore-based, making maintenance much cheaper. The OWC works on a simple principle. As an incoming wave causes the water level in the unit's main chamber to rise (see diagram), air is forced up a funnel which houses a Well's counter-rotating turbine. As the wave retreats, air is sucked down into the main chamber again. The Well's turbine has been developed to spin in the same direction, whichever way air is flowing, in order to maximize efficiency. Although most previous OWC systems have had vertical water columns that in LIMPET is angled at 45° - which wave tank test show to be more efficient.

OWC schematic

OWC machines have already been tested at a number of sites, including Japan and Norway. A commercial-scale (500 kW) installation is due to be commissioned on the Scottish Island of Islay in September 2000. The Islay OWC (known as LIMPET) is a joint venture between Queens University, WAVEGEN, Instituto Superior Técnico (Portugal), the European Union and Charles Brand Engineering. It is the direct successor of an experimental 75 kW turbine (built by researchers from the Queen's University of Belfast) which operated on the island between 1991 and 1999. Another LIMPET is currently being developed (at pilot-plant scale) on the Azores.

Construction of OWCs

One of the great problems with shoreline-based OWCs is their construction, which must necessarily take place on rocky shores exposed to wind and waves. In the case of the prototype Islay OWC system it was relatively easy to build a temporary dam on the shoreline to protect the unit. However, LIMPET is a much larger system, with a lip 20m wide. It was therefore ultimately decided to build the unit back from the coastline and remove a bund to make the system fully operational.

However, both OWC-systems and ocean-wave systems suffer from trying to harness violent forces. The first Norwegian OWC was ripped off a cliff-face during a storm, the Islay station is completely submerged under storm conditions. Thus, researchers are looking at other ways of generating electricity from the ocean, and are increasingly turning to tidally-generated coastal currents

TIDAL ENERGY

Tidal energy works from the power of changing tides. Tidal changes in sea level can be used to generate electricity, by building a dam across a costal bay or estuary with large differences between low and high tides. The high tides allow immense amounts of water to rush into the bay. The gates of the dam then shut when water level is at its maximum height. Holes in the bottom of the dam let water (at great speed and pressure) to rush past turbines. The flow of water generates enough power to turn the turbines which creates electricity. The entire process repeats with each high tide.

Two current technologies which are used to harness the kinetic energy of tidal flow:

Drag Devices Water wheels:

insufficient compared to other modes of generation

blade speed can not exceed that of the current

2) Lift Devices Turbines:

wind mill technology applied to liquid environment

more efficient then drag devices

refined propeller achieves speeds several times faster then the current

Tides: Gravitational Energy

Tides, the daily rise and fall of ocean levels relative to coastlines, are a result of the gravitational force of the moon and sun as well as the revolution of the earth. The moon and the sun both exert a gravitational force of attraction on the earth. The magnitude of the gravitational attraction of an object is dependant upon the mass of an object and its distance. The moon exerts a larger gravitational force on the earth because, although it is much smaller in mass, it is a great deal closer than the sun. This force of attraction causes the oceans, which make up 71% of the earth's surface, to bulge along an axis pointing towards the moon. Tides are produced by the rotation of the earth beneath this bulge in its watery coating, resulting in the rhythmic rise and fall of coastal ocean levels.

The gravitational attraction of the sun also affects the tides in a similar manner as the moon, but to a lesser degree. As well as bulging towards the moon, the oceans also bulge slightly towards the sun. When the earth, moon and sun are positioned in a straight line (a full or new moon), the gravitational attractions are combined, resulting in very large "spring" tides. At half moon, the sun and moon are at right angles, resulting in lower tides called "neap" tides. Coastal areas experience two high and two low tides over a period of slightly greater than 24 hours. The friction of the bulging oceans acting on the spinning earth results in a very gradual slowing down of the earth's rotation. This will not have any significant effect for billions of years. Therefore, for human purposes, tidal energy can be considered a sustainable and renewable source of energy.

Certain coastal regions experience higher tides than others. This is a result of the amplification of tides caused by local geographical features such as bays and inlets. In order to produce practical amounts of power (electricity), a difference between high and low tides of at least five meters is required. There are about 40 sites around the world with this magnitude of tidal range. In Canada, the only practical site for exploiting tidal energy is the Bay of Fundy between New Brunswick and Nova Scotia. The higher the tides, the more electricity can be generated from a given site, and the lower the cost of electricity produced. Worldwide, approximately 3000 giga watts (1 giga watt = 1 GW = 1 billion watts) of energy is continuously available from the action of tides. Due to the constraints outlined above, it has been estimated that only 2% or 60 GW can potentially be recovered for electricity generation.

Exploiting the Resource:

The technology required to convert tidal energy into electricity is very similar to the technology used in traditional hydroelectric power plants. The first requirement is a dam or "barrage" across a tidal bay or estuary. Building dams is an expensive process. Therefore, the best tidal sites are those where a bay has a narrow opening, thus reducing the length of dam which is required. At certain points along the dam, gates and turbines are installed. When there is an adequate difference in the elevation of the water on the different sides of the barrage, the gates are opened. This "hydrostatic head" that is created, causes water to flow through the turbines, turning an electric generator to produce electricity.

Electricity can be generated by water flowing both into and out of a bay. As there are two high and two low tides each day, electrical generation from tidal power plants is characterized by periods of maximum generation every twelve hours, with no electricity generation at the six hour mark in between. Alternatively, the turbines can be used as pumps to pump extra water into the basin behind the barrage during periods of low electricity demand. This water can then be released when demand on the system it’s greatest, thus allowing the tidal plant to function with some of the characteristics of a "pumped storage" hydroelectric facility.

How it works

Tidal power works rather like a hydro-electric scheme, except that the dam is much bigger. A huge dam (called a "barrage") is built across a river estuary. When the tide goes in and out, the water flows through tunnels in the dam. The ebb and flow of the tides can be used to turn a turbine, or it can be used to push air through a pipe, which then turns a turbine. Large lock gates, like the ones used on canals, allow ships to pass. If one was built across the Severn Estuary, the tides at Weston-super-Mare would not go out nearly as far - there'd be water to play in for most of the time. But the Severn Estuary carries sewage and other wastes from many places ster out to sea. A tidal barrage would mean that this stuff would hang around Weston-super-Mare an awful lot longer.

Blue energy

The Blue Energy Ocean Turbine acts as a highly efficient underwater vertical-axis windmill. Sea water is 832 times denser than air and a non-compressible medium, an 8 knot tidal current is the equivalent of a 390 km/hr wind. Developed by veteran aerospace engineer Barry Davis, the vertical-axis turbine represents two decades of Canadian research and development. Four fixed hydrofoil blades of the Blue Energy Ocean Turbine are connected to a rotor that drives an integrated gearbox and electrical generator assembly. The turbine is mounted in a durable concrete marine caisson which anchors the unit to the ocean floor, directs flow through the turbine further concentrating the resource supporting the coupler, gearbox, and generator above it. These sit above the surface of the water and are readily accessible for maintenance and repair. The hydrofoil blades employ a hydrodynamic lift principal that causes the turbine foils to move proportionately faster than the speed of the surrounding water. Computer optimized cross-flow design ensure that the rotation of the turbine is unidirectional on both the ebb and the flow of the tide.

The design of the Blue Energy Ocean Turbine requires no new construction methodology: It is structurally and mechanically straightforward. The transmission and electrical systems are similar to thousands of existing hydroelectric installations. Power transmission is by submersible kV DC cabling and safely buried in the ocean sediments with power drop points for coastal cities and connections to the continental power grid. A standardized high production design makes the system economic to build,install&maintain.

The Blue Energy Ocean Turbine can be arranged in four distinct and flexible platforms

Micro Power System - This is a 5 to 25kW assembly to service the remote domestic consumer.

Midrange Power System - Blue Energy is preparing to install a 500kW ocean energy system. Using two 250kW Blue Energy ocean turbines, this unit will be off grid competitive initially, and in three to four years time be grid competitive. Suitable for use in remote communities, industrial sites, and resorts in regions with net metering policies or dependence on costly and polluting diesel generation.

Blue Energy Power System - For large scale power production, multiple turbines are linked in series to create a tidal fence across an ocean passage or inlet. These are large scale, site specific, custom engineered energy installations which will vary in size and output by location. These structures have the added benefit as a transportation solution.

Mega Power System - A scaled-up version of the Blue Energy Power System, the mega class is a tidal fence capable of producing thousands of megawatts of power. These tidal fences can be many kilometers long and can operate in depths of up to 70 meters.

TIDALTURBINES: Rather like an underwater wind farm. This has the advantage of being much cheaper to build, and does not have the environmental problems that a tidal barrage would bring.

Tidal turbines are the chief competition to the tidal fence. Looking like an underwater wind turbine they offer a number of advantages over the tidal fence. They are less disruptive to wildlife, allow small boats to continue to use the area, and have much lower material requirements than the fence.

Tidal turbines function well where coastal currents run at 2-2.5 m/s (slower currents tend to be uneconomic while larger ones put a lot of stress on the equipment). Such currents provide an energy density four times greater than air, meaning that a 15m diameter turbine will generate as much energy as a 60m diameter windmill. In addition, tidal currents are both predictable and reliable, a feature which gives them an advantage over both wind and solar systems. The tidal turbine also offers significant environmental advantages over wind and solar systems; the majority of the assembly is hidden below the water

SMALL SCALE TIDAL POWER:

Although harnessing the tides for electrical (or mechanical) energy is not new, it's not widely implemented; because, basically a barrage is to be build. The Bay of Fundy, which experiences the world's largest tides, is one location that produces tidal electricity. This tidal power can also be utilized for small scale power production. Basically, the device would be anchored to the bottom of the ocean by a post (with gear notches along one side), just a bit further than the low tide mark. A floating section, provided by a large buoyant device would then float on the surface of the water. The relative motion between the buoyant section and the post would produce energy, via a gear system that engages the teeth on the post. Obviously the relative motion is quite small... a tide may only rise a few feet. The brawn comes from how the gears are implemented, and how much force the floating section can produce. The floating section should to be fairly light, and having it ride the ocean back to low tide wouldn't produce enough force (only the force of gravity) to generate power.

ADVANTAGES

Wave power (and tidal power) are beginning to come into their own. Benefits Deep Ocean.

Renewable and sustainable resource

Reduces dependence upon fossil fuels

Produces no liquid or solid pollution

Little visual impact

Construction of large scale offshore devices results in new areas of sheltered water, attractive for fish, sea birds, seals and seaweed

Present no difficulty to migrating fish (except tidal fences)

Shelter the coast, useful in harbor areas or erosion zones

Resource exists on a worldwide scale from deep ocean waters

Short time scale between investing in the modular construction and benefiting from the revenue

DISADVANTAGES

Very expensive to build.

Affects a very wide area - the environment is changed for many miles upstream&downstream.

Many birds rely on the tide uncovering the mud flats so that they can feed.

Only provides power for around 10 hours each day, when the tide is actually moving in or out.

There are very few suitable sites for tidal power stations.

CONCLUSION

The Department of Energy has shown great enthusiasm regarding tidal power as a future energy source than any other renewable energy sources. Our philosophy regarding energy will change drastically from the present into the future. In a society with increasing energy demands and decreasing supplies, we must look to the future and develop our best potential renewable resource. Tidal power fits the bill, a natural source of energy with many benefits. The planet's tidal capability greatly exceeds that of the world’s entire coal and oil supply. It is an ideal source of energy with great potential. When developed, tidal power could be a primary provider for our future energy requirements.

REFERENCES

www.iclei.org

www.bluenergy.com

www.darvill.clara.net

Ruth Howes and Anthony Fainberg, the Energy Sourcebook: A Guide to Technology, Resources and Policy, American Institute of Physics, 1991.

Walter C. Patterson, The Energy Alternative, Boxtree Ltd., London, 1990.

Clive Baker, "Tidal Power", Energy Policy, October 1991.

S.David J. Cuff & William J Young, The United States Energy Atlas, Second Edition, Macmillan Publishing, New York, 1986.

Friday, September 17, 2010

Alexander the Great



Alexander the Great
Basileus of Macedon
Meister der Alexanderschlacht 002.jpg
Alexander fighting the Persian king Darius III. From Alexander Mosaic, from Pompeii, Naples, Naples National Archaeological Museum
Reign336–323 BC
Full nameAlexander III of Macedon
GreekΜέγας Ἀλέξανδροςiv[›] (Mégas Aléxandros, Great Alexander)
Ἀλέξανδρος ὁ Μέγας (Aléxandros ho Mégas, Alexander the Great)
TitlesHegemon of the Hellenic League, Shahanshah of Persia, Pharaoh of Egypt and Lord of Asia
Born20 or 21 July 356 BC
BirthplacePella, Macedon
Died10 or 11 June 323 BC (aged 32)
Place of deathBabylon
PredecessorPhilip II of Macedon
SuccessorAlexander IV of Macedon
Philip III of Macedon
WivesRoxana of Bactria
Stateira of Persia
OffspringAlexander IV of Macedon
DynastyArgead dynasty
FatherPhilip II of Macedon
MotherOlympias of Epirus

Alexander III of Macedon (356–323 BC), popularly known as Alexander the Great (Greek: Μέγας Ἀλέξανδρος, Mégas Aléxandros), was a Greeki[›] king (basileus) of Macedon. He is the most celebrated member of the Argead Dynasty and created one of the largest empires in ancient history. Born in Pella in 356 BC, Alexander was tutored by the famed philosopher Aristotle, succeeded his father Philip II of Macedon to the throne in 336 BC after the King was assassinated, and died thirteen years later at the age of 32. Although both Alexander's reign and empire were short-lived, the cultural impact of his conquests lasted for centuries. Alexander was known to be undefeated in battle and is considered one of the most successful commanders of all time.[1] He is one of the most famous figures of antiquity, and is remembered for his tactical ability, for his conquests, and for spreading Greek culture into the East, marking the beginning of Hellenistic civilization.
Philip had brought most of the city-states of mainland Greece under Macedonian hegemony, using both military and diplomatic means. Upon Philip's death, Alexander inherited a strong kingdom and an experienced army. He succeeded in being awarded the generalship of Greece and, with his authority firmly established, launched the military plans for expansion left by his father. He invaded Persian-ruled Asia Minor, and began a series of campaigns lasting ten years. Alexander repeatedly defeated the Persians in battle; marched through Syria, Egypt, Mesopotamia, Persia, and Bactria; and in the process he overthrew the Persian king Darius III and conquered the entirety of the Persian Empire.ii[›] Following his desire to reach the "ends of the world and the Great Outer Sea", he invaded India, but was eventually forced to turn back by the near-mutiny of his troops.
Alexander died in Babylon in 323 BC, before realizing a series of planned campaigns that would have begun with an invasion of Arabia. In the years following Alexander's death, a series of civil wars tore his empire apart, which resulted in the formation of a number of states ruled by Macedonian aristocracy (the Diadochi). Remarkable though his conquests were, Alexander's lasting legacy was not his reign, but the cultural diffusion his conquests engendered. Alexander's importation of Greek colonists and culture to the East resulted in a new Hellenistic culture, aspects of which were still evident in the traditions of the Byzantine Empire until the mid-15th century. Alexander became legendary as a classical hero in the mold of Achilles, and features prominently in the history and myth of Greek and non-Greek cultures. He became the measure against which generals, even to this day, compare themselves, and military academies throughout the world still teach his tactical exploits.iii[›]

Early life

Lineage and childhood

"The night before the consummation of their marriage, she dreamed that a thunderbolt fell upon her body, which kindled a great fire, whose divided flames dispersed themselves all about, and then were extinguished. And Philip, some time after he was married, dreamed that he sealed up his wife's body with a seal, whose impression, as he fancied, was the figure of a lion. Some of the diviners interpreted this as a warning to Philip to look narrowly to his wife; but Aristander of Telmessus, considering how unusual it was to seal up anything that was empty, assured him the meaning of his dream was that the queen was with child of a boy, who would one day prove as stout and courageous as a lion."
Plutarch describing Olympias and Philip's dreams.[2]
Alexander was born on 20 (or 21) July 356 BC,[3][4] in Pella, the capital of the Kingdom of Macedon. He was the son of Philip II, the King of Macedon. His mother was Philip's fourth wife Olympias, the daughter of Neoptolemus I, the king of the northern Greek state of Epirus.[2][5][6][7] Although Philip had either seven or eight wives, Olympias was his principal wife for a time.
As a member of the Argead dynasty, Alexander claimed patrilineal descent from Heracles through Caranus of Macedon.v[›] From his mother's side and the Aeacids, he claimed descent from Neoptolemus, son of Achilles;vi[›] Alexander was a second cousin of the celebrated general Pyrrhus of Epirus, who was ranked by Hannibal as, depending on the source, either the best[8] or second-best (after Alexander)[9] commander the world had ever seen.
According to the ancient Greek historian Plutarch, Olympias, on the eve of the consummation of her marriage to Philip, dreamed that her womb was struck by a thunder bolt, causing a flame that spread "far and wide" before dying away. Some time after the wedding, Philip was said to have seen himself, in a dream, sealing up his wife's womb with a seal upon which was engraved the image of a lion.[2] Plutarch offers a variety of interpretations of these dreams: that Olympia was pregnant before her marriage, indicated by the sealing of her womb; or that Alexander's father was Zeus. Ancient commentators were divided as to whether the ambitious Olympias promulgated the story of Alexander's divine parentage, some claiming she told Alexander, others that she dismissed the suggestion as impious.[2]
On the day that Alexander was born, Philip was preparing himself for his siege on the city of Potidea on the peninsula of Chalkidiki. On the same day, Philip received news that his general Parmenion had defeated the combined Illyrian and Paeonian armies, and that his horses had won at the Olympic Games. It was also said that on this day, the Temple of Artemis in Ephesus—one of the Seven Wonders of the World—burnt down, leading Hegesias of Magnesia to say that it burnt down because Artemis was attending the birth of Alexander.[3][6][10]

Alexander fighting an Asiatic lion with his friend Craterus (detail). 3rd century BC mosaic, Pella Museum.
In his early years, Alexander was raised by his nurse, Lanike, the sister of Alexander's future friend and general Cleitus the Black. Later on in his childhood, Alexander was tutored by the strict Leonidas, a relative of his mother, and by Lysimachus.[11][12]
When Alexander was ten years old, a horse trader from Thessaly brought Philip a horse, which he offered to sell for thirteen talents. The horse refused to be mounted by anyone, and Philip ordered it to be taken away. Alexander, however, detected the horse's fear of his own shadow and asked for a turn to tame the horse, which he eventually managed. According to Plutarch, Philip, overjoyed at this display of courage and ambition, kissed him tearfully, declaring: "My boy, you must find a kingdom big enough for your ambitions. Macedon is too small for you", and bought the horse for him.[13] Alexander would name the horse Bucephalus, meaning 'ox-head'. Bucephalus would be Alexander's companion throughout his journeys as far as India. When Bucephalus died (due to old age, according to Plutarch, for he was already thirty), Alexander named a city after him (Bucephala).[14][15][16]

Adolescence and education


Aristotle tutoring Alexander.
When Alexander was thirteen years old, Philip decided that Alexander needed a higher education, and he began to search for a tutor. Many people were passed over including Isocrates and Speusippus, Plato's successor at the Academy, who offered to resign to take up the post. In the end, Philip offered the job to Aristotle, who accepted, and Philip gave them the Temple of the Nymphs at Mieza as their classroom. In return for teaching Alexander, Philip agreed to rebuild Aristotle's hometown of Stageira, which Philip had razed, and to repopulate it by buying and freeing the ex-citizens who were slaves, or pardoning those who were in exile.[17][18][19][20]
Mieza was like a boarding school for Alexander and the children of Macedonian nobles, such as Ptolemy, Hephaistion, and Cassander. Many of the pupils who learned by Alexander's side would become his friends and future generals, and are often referred to as the 'Companions'. At Mieza, Aristotle educated Alexander and his companions in medicine, philosophy, morals, religion, logic, and art. From Aristotle's teaching, Alexander developed a passion for the works of Homer, and in particular the Iliad; Aristotle gave him an annotated copy, which Alexander was to take on his campaigns.[21][22][23][24]

Philip's heir

Regency and ascent of Macedon


A bust depicting Philip II of Macedon, Alexander's father
When Alexander became sixteen years old, his tutorship under Aristotle came to an end. Philip, the king, departed to wage war against Byzantium, and Alexander was left in charge as regent of the kingdom. During Philip's absence, the Thracian Maedi revolted against Macedonian rule. Alexander responded quickly; he crushed the Maedi insurgence, driving them from their territory, colonised it with Greeks, and founded a city named Alexandropolis.[25][26][27][28]
After Philip's return from Byzantium, he dispatched Alexander with a small force to subdue certain revolts in southern Thrace. During another campaign against the Greek city of Perinthus, Alexander is reported to have saved his father's life. Meanwhile, the city of Amphissa began to work lands that were sacred to Apollo near Delphi, a sacrilege that gave Philip the opportunity to further intervene in the affairs of Greece. Still occupied in Thrace, Philip ordered Alexander to begin mustering an army for a campaign in Greece. Concerned with the possibility of other Greek states intervening, Alexander made it look as if he was preparing to attack Illyria instead. During this turmoil, the Illyrians took the opportunity to invade Macedonia, but Alexander repelled the invaders.[29]
Philip joined Alexander with his army in 338 BC, and they marched south through Thermopylae, which they took after a stubborn resistance from its Theban garrison. They went on to occupy the city of Elatea, a few days march from both Athens and Thebes. Meanwhile, the Athenians, led by Demosthenes, voted to seek an alliance with Thebes in the war against Macedonia. Both Athens and Philip sent embassies to try to win Thebes's favour, with the Athenians eventually succeeding.[30][31][32] Philip marched on Amphissa (theoretically acting on the request of the Amphicytonic League), captured the mercenaries sent there by Demosthenes, and accepted the city's surrender. Philip then returned to Elatea and sent a final offer of peace to Athens and Thebes, which was rejected.[33][34][35]

Statue of Alexander in Istanbul Archaeology Museum.
As Philip marched south, he was blocked near Chaeronea, Boeotia by the forces of Athens and Thebes. During the ensuing Battle of Chaeronea, Philip commanded the right, and Alexander the left wing, accompanied by a group of Philip's trusted generals. According to the ancient sources, the two sides fought bitterly for a long time. Philip deliberately commanded the troops on his right wing to backstep, counting on the untested Athenian hoplites to follow, thus breaking their line. On the left, Alexander was the first to break into the Theban lines, followed by Philip's generals. Having achieved a breach in the enemy's cohesion, Philip ordered his troops to press forward and quickly routed his enemy. With the rout of the Athenians, the Thebans were left to fight alone; surrounded by the victorious enemy, they were crushed.[36]
After the victory at Chaeronea, Philip and Alexander marched unopposed into the Peloponnese welcomed by all cities; however, when they reached Sparta, they were refused, and they simply left.[37] At Corinth, Philip established a "Hellenic Alliance" (modeled on the old anti-Persian alliance of the Greco-Persian Wars), with the exception of Sparta. Philip was then named Hegemon (often translated as 'Supreme Commander') of this league (known by modern historians as the League of Corinth). He then announced his plans for a war of revenge against the Persian Empire, which he would command.[38][39]

Exile and return

"At the wedding of Cleopatra, whom Philip fell in love with and married, she being much too young for him, her uncle Attalus in his drink desired the Macedonians would implore the gods to give them a lawful successor to the kingdom by his niece. This so irritated Alexander, that throwing one of the cups at his head, "You villain," said he, "what, am I then a bastard?" Then Philip, taking Attalus's part, rose up and would have run his son through; but by good fortune for them both, either his over-hasty rage, or the wine he had drunk, made his foot slip, so that he fell down on the floor. At which Alexander reproachfully insulted over him: "See there," said he, "the man who makes preparations to pass out of Europe into Asia, overturned in passing from one seat to another."
— Plutarch, describing the feud at Philip's wedding.[25]
After returning to Pella, Philip fell in love with and married Cleopatra Eurydice, the niece of one of his generals, Attalus. This marriage made Alexander's position as heir to the throne less secure, since if Cleopatra Eurydice bore Philip a son, there would be a fully Macedonian heir, while Alexander was only half Macedonian.[40] During the wedding banquet, a drunken Attalus made a speech praying to the gods that the union would produce a legitimate heir to the Macedonian throne. Alexander shouted to Attalus, "What am I then, a bastard?" and he threw his goblet at him. Philip, who was also drunk, drew his sword and advanced towards Alexander before collapsing, leading Alexander to say, "See there, the man who makes preparations to pass out of Europe into Asia, overturned in passing from one seat to another."[25]
Alexander fled from Macedon taking his mother with him, whom he dropped off with her brother in Dodona, capital of Epirus. He carried on to Illyria, where he sought refuge with the Illyrian King and was treated as a guest by the Illyrians, despite having defeated them in battle a few years before. Alexander returned to Macedon after six months in exile due to the efforts of a family friend, Demaratus the Corinthian, who mediated between the two parties.[25][41][42]
The following year, the Persian satrap (governor) of Caria, Pixodarus, offered the hand of his eldest daughter to Alexander's half-brother, Philip Arrhidaeus. Olympias and several of Alexander's friends suggested to Alexander that this move showed that Philip intended to make Arrhidaeus his heir. Alexander reacted by sending an actor, Thessalus of Corinth, to tell Pixodarus that he should not offer his daughter's hand to an illegitimate son, but instead to Alexander. When Philip heard of this, he scolded Alexander for wishing to marry the daughter of a Carian. Philip had four of Alexander's friends, Harpalus, Nearchus, Ptolemy and Erigyius exiled, and had the Corinthians bring Thessalus to him in chains.[40][43][44]

King of Macedon

Accession


The Kingdom of Macedon in 336 BC
In 336 BC, whilst at Aegae, attending the wedding of his daughter by Olympias, Cleopatra, to Olympias's brother, Alexander I of Epirus, Philip was assassinated by the captain of his bodyguard, Pausanias.vii[›] As Pausanias tried to escape, he tripped over a vine and was killed by his pursuers, including two of Alexander's companions, Perdiccas and Leonnatus. Alexander was proclaimed king by the Macedonian army and by the Macedonian noblemen at the age of 20.[45][46][47]

Power consolidation

Alexander began his reign by having his potential rivals to the throne murdered. He had his cousin, the former Amyntas IV, executed, as well as having two Macedonian princes from the region of Lyncestis killed, while a third, Alexander Lyncestes, was spared. Olympias had Cleopatra Eurydice and her daughter by Philip, Europa, burned alive. When Alexander found out about this, he was furious with his mother. Alexander also ordered the murder of Attalus, who was in command of the advance guard of the army in Asia Minor. Attalus was at the time in correspondence with Demosthenes, regarding the possibility of defecting to Athens. Regardless of whether Attalus actually intended to defect, he had already severely insulted Alexander, and having just had Attalus's daughter and grandchildren murdered, Alexander probably felt Attalus was too dangerous to leave alive.[48] Alexander spared the life of Arrhidaeus, who was by all accounts mentally disabled, possibly as a result of poisoning by Olympias.[45][49][50][51]
News of Philip's death roused many states into revolt, including Thebes, Athens, Thessaly, and the Thracian tribes to the north of Macedon. When news of the revolts in Greece reached Alexander, he responded quickly. Though his advisors advised him to use diplomacy, Alexander mustered the Macedonian cavalry of 3,000 men and rode south towards Thessaly, Macedon's neighbor to the south. When he found the Thessalian army occupying the pass between Mount Olympus and Mount Ossa, he had the men ride over Mount Ossa. When the Thessalians awoke the next day, they found Alexander in their rear, and promptly surrendered, adding their cavalry to Alexander's force, as he rode down towards the Peloponnesus.[52][53][54][55]
Alexander stopped at Thermopylae, where he was recognized as the leader of the Amphictyonic League before heading south to Corinth. Athens sued for peace and Alexander received the envoy and pardoned anyone involved with the uprising. At Corinth, where occurred the famous encounter with Diogenes the Cynic, who asked him to stand a little aside as he was blocking the sun,[56] Alexander was given the title Hegemon, and like Philip, appointed commander of the forthcoming war against Persia. While at Corinth, he heard the news of the Thracian rising to the north.[53][57]

Balkan campaign


Before crossing to Asia, Alexander wanted to safeguard his northern borders; and, in the spring of 335 BC, he advanced to suppress several apparent revolts. Starting from Amphipolis, he first went east into the country of the "Independent Thracians"; and at Mount Haemus, the Macedonian army attacked and defeated a Thracian army manning the heights.[58] The Macedonians marched on into the country of the Triballi, and proceeded to defeat the Triballian army near the Lyginus river [59] (a tributary of the Danube). Alexander then advanced for three days on to the Danube, encountering the Getae tribe on the opposite shore. Surprising the Getae by crossing the river at night, he forced the Getae army to retreat after the first cavalry skirmish, leaving their town to the Macedonian army.[60][61] News then reached Alexander that Cleitus, King of Illyria, and King Glaukias of the Taulanti were in open revolt against Macedonian authority. Marching west into Illyria, Alexander defeated each in turn, forcing Cleitus and Glaukias to flee with their armies, leaving Alexander's northern frontier secure.[62][63]
While he was triumphantly campaigning north, the Thebans and Athenians rebelled once more. Alexander reacted immediately, but, while the other cities once again hesitated, Thebes decided to resist with the utmost vigor. However, the resistance was useless, as the city was razed to the ground amid great bloodshed, and its territory was divided between the other Boeotian cities. The end of Thebes cowed Athens into submission, leaving all of Greece at least outwardly at peace with Alexander.[64]

Conquest of the Persian Empire


Asia Minor


Map of Alexander's empire and the paths he took
Alexander's army crossed the Hellespont in 334 BC with approximately 42,000 soldiers from Macedon and various Greek city-states, mercenaries, and feudally raised soldiers from Thrace, Paionia, and Illyria.[65] After an initial victory against Persian forces at the Battle of the Granicus, Alexander accepted the surrender of the Persian provincial capital and treasury of Sardis and proceeded down the Ionian coast.[66] At Halicarnassus, Alexander successfully waged the first of many sieges, eventually forcing his opponents, the mercenary captain Memnon of Rhodes and the Persian satrap of Caria, Orontobates, to withdraw by sea.[67] Alexander left the government of Caria to Ada, who adopted Alexander as her son.[68]
From Halicarnassus, Alexander proceeded into mountainous Lycia and the Pamphylian plain, asserting control over all coastal cities. He did this to deny the Persians naval bases. Since Alexander had no reliable fleet of his own, defeating the Persian fleet required land control.[69] From Pamphylia onward, the coast held no major ports and so Alexander moved inland. At Termessos, Alexander humbled but did not storm the Pisidian city.[70] At the ancient Phrygian capital of Gordium, Alexander 'undid' the hitherto unsolvable Gordian Knot, a feat said to await the future "king of Asia".[71] According to the most vivid story, Alexander proclaimed that it did not matter how the knot was undone, and he hacked it apart with his sword.[72]

The Levant and Syria


Alexander Mosaic, showing Battle of Issus, from the House of the Faun, Pompeii
After spending the winter campaigning in Asia Minor, Alexander's army crossed the Cilician Gates in 333 BC, and defeated the main Persian army under the command of Darius III at the Battle of Issus in November.[73] Darius fled the battle, causing his army to break, and left behind his wife, his two daughters, his mother Sisygambis, and a fabulous amount of treasure.[74] He afterward offered a peace treaty to Alexander, the concession of the lands he had already conquered, and a ransom of 10,000 talents for his family. Alexander replied that since he was now king of Asia, it was he alone who decided territorial divisions.[75]
Alexander proceeded to take possession of Syria, and most of the coast of the Levant.[76] However, the following year, 332 BC, he was forced to attack Tyre, which he eventually captured after a famous siege.[77][78] After the capture of Tyre, Alexander crucified all the men of military age, and sold the women and children into slavery.[79]

Egypt


Egyptian alabaster statuette of Alexander the Great in the Brooklyn Museum
When Alexander destroyed Tyre, most of the towns on the route to Egypt quickly capitulated, with the exception of Gaza. The stronghold at Gaza was built on a hill and was heavily fortified.[80] At the beginning of the Siege of Gaza, Alexander utilized the engines he had employed against Tyre. After three unsuccessful assaults, the stronghold was finally taken by force, but not before Alexander received a serious shoulder wound. When Gaza was taken, the male population was put to the sword and the women and children were sold into slavery.[81]
Jerusalem, on the other hand, opened its gates in surrender, and according to Josephus, Alexander was shown the book of Daniel's prophecy, presumably chapter 8, where a mighty Greek king would subdue and conquer the Persian Empire. Thereupon, Alexander spared Jerusalem and pushed south into Egypt.[82][83]
Alexander advanced on Egypt in later 332 BC, where he was regarded as a liberator.[84] He was pronounced the new "master of the Universe" and son of the deity of Amun at the Oracle of Siwa Oasis in the Libyan desert.[85] Henceforth, Alexander often referred to Zeus-Ammon as his true father, and subsequent currency depicted him adorned with ram horns as a symbol of his divinity.[86][87] During his stay in Egypt, he founded Alexandria-by-Egypt, which would become the prosperous capital of the Ptolemaic kingdom after his death.[88]

Assyria and Babylonia


Initial dispositions and opening movements in the Battle of Gaugamela, 331 BC.
Leaving Egypt in 331 BC, Alexander marched eastward into Mesopotamia (now northern Iraq) and defeated Darius once more at the Battle of Gaugamela.[89] Once again, Darius was forced to leave the field, and Alexander chased him as far as Arbela. Darius fled over the mountains to Ecbatana (modern Hamedan), but Alexander instead marched to and captured Babylon.[90]

Persia

From Babylon, Alexander went to Susa, one of the Achaemenid capitals, and captured its legendary treasury.[90] Sending the bulk of his army to the Persian ceremonial capital of Persepolis via the Royal Road, Alexander himself took selected troops on the direct route to the city. However, the pass of the Persian Gates (in the modern Zagros Mountains) had been blocked by a Persian army under Ariobarzanes, and Alexander had to storm the pass. Alexander then made a dash for Persepolis before its garrison could loot the treasury.[91] At Persepolis, Alexander stared at the crumbled statue of Xerxes and decided to leave it on the ground.[92][93] During their stay at the capital, a fire broke out in the eastern palace of Xerxes and spread to the rest of the city. Theories abound as to whether this was the result of a drunken accident, or a deliberate act of revenge for the burning of the Acropolis of Athens during the Second Persian War.[93]

Fall of the Empire and the East

Alexander then set off in pursuit of Darius again, first into Media, and then Parthia.[94] The Persian king was no longer in control of his destiny, having been taken prisoner by Bessus, his Bactrian satrap and kinsman.[95] As Alexander approached, Bessus had his men fatally stab the Great King and then declared himself Darius' successor as Artaxerxes V, before retreating into Central Asia to launch a guerrilla campaign against Alexander.[96] Darius' remains were buried by Alexander next to his Achaemenid predecessors in a full regal funeral.[97] Alexander claimed that, while dying, Darius had named him as his successor to the Achaemenid throne.[98] The Achaemenid Empire is normally considered to have fallen with the death of Darius.[99]

Silver coin of Alexander, British Museum
Alexander, now considering himself the legitimate successor to Darius, viewed Bessus as a usurper to the Achaemenid throne, and set out to defeat him. This campaign, initially against Bessus, turned into a grand tour of central Asia, with Alexander founding a series of new cities, all called Alexandria, including modern Kandahar in Afghanistan, and Alexandria Eschate ("The Furthest") in modern Tajikistan. The campaign took Alexander through Media, Parthia, Aria (West Afghanistan), Drangiana, Arachosia (South and Central Afghanistan), Bactria (North and Central Afghanistan), and Scythia.[100]
Bessus was betrayed in 329 BC by Spitamenes, who held an undefined position in the satrapy of Sogdiana. Spitamenes handed over Bessus to Ptolemy, one of Alexander's trusted companions, and Bessus was executed.[101] However, when, at some point later, Alexander was on the Jaxartes dealing with an incursion by a horse nomad army, Spitamenes raised Sogdiana in revolt. Alexander personally defeated the Scythians at the Battle of Jaxartes and immediately launched a campaign against Spitamenes and defeated him in the Battle of Gabai; after the defeat, Spitamenes was killed by his own men, who then sued for peace.[102]

Problems and plots

During this time, Alexander took the Persian title "King of Kings" (Shahanshah) and adopted some elements of Persian dress and customs at his court, notably the custom of proskynesis, either a symbolic kissing of the hand, or prostration on the ground, that Persians paid to their social superiors.[103][104] The Greeks regarded the gesture as the province of deities and believed that Alexander meant to deify himself by requiring it. This cost him much in the sympathies of many of his countrymen.[104] A plot against his life was revealed, and one of his officers, Philotas, was executed for failing to bring the plot to his attention. The death of the son necessitated the death of the father, and thus Parmenion, who had been charged with guarding the treasury at Ecbatana, was assassinated by command of Alexander, so he might not make attempts at vengeance. Most infamously, Alexander personally slew the man who had saved his life at Granicus, Cleitus the Black, during a drunken argument at Maracanda.[105] Later, in the Central Asian campaign, a second plot against his life was revealed, this one instigated by his own royal pages. His official historian, Callisthenes of Olynthus (who had fallen out of favor with the king by leading the opposition to his attempt to introduce proskynesis), was implicated in the plot; however, there has never been consensus among historians regarding his involvement in the conspiracy.[106]

Indian campaign


Invasion of the Indian subcontinent

After the death of Spitamenes and his marriage to Roxana (Roshanak in Bactrian) to cement his relations with his new Central Asian satrapies, Alexander was finally free to turn his attention to the Indian subcontinent. Alexander invited all the chieftains of the former satrapy of Gandhara, in the north of what is now Pakistan, to come to him and submit to his authority. Omphis (whose actual name is Ambhi), ruler of Taxila, whose kingdom extended from the Indus to the Hydaspes, complied, but the chieftains of some hill clans, including the Aspasioi and Assakenoi sections of the Kambojas (known in Indian texts also as Ashvayanas and Ashvakayanas), refused to submit.[107]

A painting by Charles Le Brun depicting Alexander and Porus (Puru) during the Battle of the Hydaspes
In the winter of 327/326 BC, Alexander personally led a campaign against these clans; the Aspasioi of Kunar valleys, the Guraeans of the Guraeus valley, and the Assakenoi of the Swat and Buner valleys.[108] A fierce contest ensued with the Aspasioi in which Alexander himself was wounded in the shoulder by a dart but eventually the Aspasioi lost the fight. Alexander then faced the Assakenoi, who fought bravely and offered stubborn resistance to Alexander in the strongholds of Massaga, Ora and Aornos.[107] The fort of Massaga could only be reduced after several days of bloody fighting in which Alexander himself was wounded seriously in the ankle. According to Curtius, "Not only did Alexander slaughter the entire population of Massaga, but also did he reduce its buildings to rubbles".[109] A similar slaughter then followed at Ora, another stronghold of the Assakenoi. In the aftermath of Massaga and Ora, numerous Assakenians fled to the fortress of Aornos. Alexander followed close behind their heels and captured the strategic hill-fort after the fourth day of a bloody fight.[107]
After Aornos, Alexander crossed the Indus and fought and won an epic battle against a local ruler Porus, who ruled a region in the Punjab, in the Battle of Hydaspes in 326 BC.[110] Alexander was greatly impressed by Porus for his bravery in battle, and therefore made an alliance with him and appointed him as satrap of his own kingdom, even adding land he did not own before. Additional reasons were probably political since, to control lands so distant from Greece required local assistance and co-operation.[111] Alexander named one of the two new cities that he founded on opposite sides of the Hydaspes river, Bucephala, in honor of the horse that had brought him to India, and had died during the battle[112] and the other Nicaea (Victory) at the site of modern day Mong.[113][114]

Revolt of the army


Campaigns and landmarks of Alexander's invasion of the Indian subcontinent.
East of Porus' kingdom, near the Ganges River, was the powerful Nanda Empire of Magadha and Gangaridai Empire of Bengal. Fearing the prospects of facing other powerful Indian armies and exhausted by years of campaigning, his army mutinied at the Hyphasis River, refusing to march further east. This river thus marks the easternmost extent of Alexander's conquests.[115][116]
As for the Macedonians, however, their struggle with Porus blunted their courage and stayed their further advance into India. For having had all they could do to repulse an enemy who mustered only twenty thousand infantry and two thousand horse, they violently opposed Alexander when he insisted on crossing the river Ganges also, the width of which, as they learned, was thirty-two furlongs, its depth a hundred fathoms, while its banks on the further side were covered with multitudes of men-at-arms and horsemen and elephants. For they were told that the kings of the Ganderites and Praesii were awaiting them with eighty thousand horsemen, two hundred thousand footmen, eight thousand chariots, and six thousand war elephants.[115]
Alexander spoke to his army and tried to persuade them to march further into India but Coenus pleaded with him to change his opinion and return, the men, he said, "longed to again see their parents, their wives and children, their homeland". Alexander, seeing the unwillingness of his men, eventually agreed and turned south. Along the way his army conquered the Malli clans (in modern day Multan), and other Indian tribes.[117]

Return

Alexander sent much of his army to Carmania (modern southern Iran) with his general Craterus, and commissioned a fleet to explore the Persian Gulf shore under his admiral Nearchus, while he led the rest of his forces back to Persia through the more difficult southern route along the Gedrosian Desert and Makran (now part of southern Iran and Pakistan).[118]

Last years in Persia

Discovering that many of his satraps and military governors had misbehaved in his absence, Alexander executed a number of them as examples, on his way to Susa.[119][120] As a gesture of thanks, he paid off the debts of his soldiers, and announced that he would send those over-aged and disabled veterans back to Macedon under Craterus. But, his troops misunderstood his intention and mutinied at the town of Opis, refusing to be sent away and bitterly criticizing his adoption of Persian customs and dress, and the introduction of Persian officers and soldiers into Macedonian units.[121] Alexander executed the ringleaders of the mutiny, but forgave the rank and file.[122] In an attempt to craft a lasting harmony between his Macedonian and Persian subjects, he held a mass marriage of his senior officers to Persian and other noblewomen at Susa, but few of those marriages seem to have lasted much beyond a year.[120] Meanwhile, upon his return, Alexander learned some men had desecrated the tomb of Cyrus the Great, and swiftly executed them, because they were put in charge of guarding the tomb Alexander held in honor.[123]
After Alexander traveled to Ecbatana to retrieve the bulk of the Persian treasure, his closest friend and possibly lover[124] Hephaestion died of an illness, or possibly of poisoning.[125] According to Plutarch, Alexander, distraught over the death of his longtime companion, sacked a nearby town, and put all of its inhabitants to the sword, as a sacrifice to Hephaestion's ghost.[126] Arrian finds great diversity and casts doubts on the accounts of Alexander's displays of grief, although he says that they all agree that Hephaestion's death devastated him, and that he ordered the preparation of an expensive funeral pyre in Babylon, as well as a decree for the observance of a public mourning.[125]
Back in Babylon, Alexander planned a series of new campaigns, beginning with an invasion of Arabia, but he would not have a chance to realize them.[127]

Death and succession

Final days


An Astronomical diary (c. 323–322 BC) recording the death of Alexander (British Museum, London)
On either 10 or 11 June 323 BC, Alexander died in the palace of Nebuchadnezzar II, in Babylon at the age of 32.[128] Plutarch gives a lengthy account of the circumstances of his death, echoed (without firm dates) by Arrian. Roughly 14 days before his death, Alexander entertained his admiral Nearchus, and then, instead of going to bed, spent the night and next day drinking with Medius of Larissa.[129] After this, and by 18 Daesius (a Macedonian month) he had developed a fever, which then grew steadily worse.[129][130] By 25 Daesius, he was unable to speak.[130] By 26 Daesius, the common soldiers had become anxious about his health, or thought he was already dead. They demanded to see him, and Alexander's generals acquiesced.[130] The soldiers slowly filed past him, whilst Alexander raised his right hand in greeting, still unable to speak.[131] Two days later, on 28 Daesius (although Aristobolus's account says it was 30 Daesius), Alexander was dead.[129][130] Conversely, Diodorus recounts that Alexander was struck down with pain after downing a large bowl of unmixed wine in honour of Hercules, and (rather mysteriously) died after some agony,[132] which is also mentioned as an alternative by Arrian, but Plutarch specifically denies this claim.[129]

Possible causes

Poison

Given the propensity of the Macedonian aristocracy to assassination,[133] it is scarcely surprising that allegations of foul play have been made about the death of Alexander. Diodorus, Plutarch, Arrian and Justin all mention the theory that Alexander was poisoned. Plutarch dismisses it as a fabrication,[49] while both Diodorus and Arrian say that they only mention it for the sake of completeness.[132][134] The accounts are nevertheless fairly consistent in designating Antipater, recently removed from the position of Macedonian viceroy, and at odds with Olympias, as the head of the alleged plot. Perhaps taking his summons to Babylon as a death sentence in waiting,[135] and having seen the fate of Parmenion and Philotas,[136] Antipater arranged for Alexander to be poisoned by his son Iollas, who was Alexander's wine-pourer.[49][134][136] There is even a suggestion that Aristotle may have had a hand in the plot.[49][134] Conversely, the strongest argument against the poison theory is the fact that twelve days had passed between the start of his illness and his death; in the ancient world, such long-acting poisons were probably not available.[137] In 2010, however, a theory was proposed that indicated that the circumstances of his death are compatible with poisoning by water of the river Styx (Mavroneri) that contained calicheamicin, a dangerous compound produced by bacteria present its waters.[138]

Natural causes

Several natural causes (diseases) have been suggested as the cause of Alexander's death; malaria or typhoid fever are obvious candidates. A 1998 article in the New England Journal of Medicine attributed his death to typhoid fever complicated by bowel perforation and ascending paralysis,[139] whereas another recent analysis has suggested pyrogenic spondylitis or meningitis as the cause.[140] Other illnesses could have also been the culprit, including acute pancreatitis or the West Nile virus.[141][142] Natural-cause theories also tend to emphasise that Alexander's health may have been in general decline after years of heavy drinking and his suffering severe wounds (including one in India that nearly claimed his life). Furthermore, the anguish that Alexander felt after Hephaestion's death may have contributed to his declining health.[139]
Another possible cause of Alexanders death is an overdose of medication containing Hellebore, which is deadly in large doses.[143][144]

Fate after death


Detail of Alexander on the Alexander Sarcophagus
Alexander's body was placed in a gold anthropoid sarcophagus, which was in turn placed in a second gold casket.[145] According to Aelian, a seer called Aristander foretold that the land where Alexander was laid to rest "would be happy and unvanquishable forever".[146] Perhaps more likely, the successors may have seen possession of the body as a symbol of legitimacy (it was a royal prerogative to bury the previous king).[147] At any rate, Ptolemy stole the funeral cortege, and took it to Memphis.[145][146] His successor, Ptolemy II Philadelphus, transferred the sarcophagus to Alexandria, where it remained until at least Late Antiquity. Ptolemy IX Lathyros, one of the last successors of Ptolemy I, replaced Alexander's sarcophagus with a glass one so he could melt the original down for issues of his coinage.[148] Pompey, Julius Caesar and Augustus all visited the tomb in Alexandria, the latter allegedly accidentally knocking the nose off the body. Caligula was said to have taken Alexander's breastplate from the tomb for his own use. In c. AD 200, Emperor Septimius Severus closed Alexander's tomb to the public. His son and successor, Caracalla, was a great admirer of Alexander, and visited the tomb in his own reign. After this, details on the fate of the tomb are sketchy.[148]
The so-called "Alexander Sarcophagus", discovered near Sidon and now in the Istanbul Archaeology Museum, is so named not because it was thought to have contained Alexander's remains, but because its bas-reliefs depict Alexander and his companions hunting and in battle with the Persians. It was originally thought to have been the sarcophagus of Abdalonymus (died 311 BC), the king of Sidon appointed by Alexander immediately following the battle of Issus in 331.[149][150][151] However, more recently, it has been suggested that it may date from earlier than Abdalonymus' death.[152]

Division of the Empire


Bust of Seleucus I Nicator, who succeeded to Alexander's eastern conquests
Alexander had no obvious or legitimate heir, his son Alexander IV by Roxane being born after Alexander's death. This left the huge question as to who would rule the newly conquered, and barely pacified Empire.[153] According to Diodorus, Alexander's companions asked him when he was on his deathbed to whom he bequeathed his kingdom; his laconic reply was "tôi kratistôi"—"to the strongest".[132] Given that Arrian and Plutarch have Alexander speechless by this point, it is possible that this is an apocryphal story.[154] Diodorus, Curtius and Justin also have the more plausible story of Alexander passing his signet ring to Perdiccas, one of his bodyguard and leader of the companion cavalry, in front of witnesses, thereby possibly nominating Perdiccas as his successor.[132][153]
In any event, Perdiccas initially avoided explicitly claiming power, instead suggesting that Roxane's baby would be king, if male; with himself, Craterus, Leonnatus and Antipater as guardians. However, the infantry, under the command of Meleager, rejected this arrangement since they had been excluded from the discussion. Instead, they supported Alexander's half-brother Philip Arrhidaeus. Eventually, the two sides reconciled, and after the birth of Alexander IV, he and Philip III were appointed joint kings of the Empire—albeit in name only.[155]
It was not long, however, before dissension and rivalry began to afflict the Macedonians. The satrapies handed out by Perdiccas at the Partition of Babylon became power bases each general could use to launch his own bid for power. After the assassination of Perdiccas in 321 BC, all semblance of Macedonian unity collapsed, and 40 years of war between "The Successors" (Diadochi) ensued before the Hellenistic world settled into four stable power blocks: the Ptolemaic kingdom of Egypt, the Seleucid Empire in the east, the Kingdom of Pergamon in Asia Minor, and Macedon. In the process, both Alexander IV and Philip III were murdered.[156]

Testament

Diodorus relates that Alexander had given detailed written instructions to Craterus some time before his death.[157] Although Craterus had already started to carry out some of Alexander's commands, the successors chose not to further implement them, on the grounds they were impractical and extravagant.[157] The testament called for military expansion into the southern and western Mediterranean, monumental constructions, and the intermixing of Eastern and Western populations. Its most remarkable items were:
  • Construction of a monumental pyre to Hephaestion, costing 10,000 talents
  • Construction of a monumental tomb for his father Philip, "to match the greatest of the pyramids of Egypt"
  • Erection of great temples in Delos, Delphi, Dodona, Dium, Amphipolis, Cyrnus, and Ilium
  • Building of "a thousand warships, larger than triremes, in Phoenicia, Syria, Cilicia, and Cyprus for the campaign against the Carthaginians and the others who live along the coast of Libya and Iberia and the adjoining coastal regions as far as Sicily"
  • Building of a road in northern Africa as far as the Pillars of Heracles, with ports and shipyards along it
  • Establishment of cities and the "transplant of populations from Asia to Europe and in the opposite direction from Europe to Asia, in order to bring the largest continent to common unity and to friendship by means of intermarriage and family ties."[135][157]

Character

Physical appearance


Roman copy of a statue by Lysippus, Louvre Museum. According to Plutarch, sculptures by Lysippus were the most faithful.
Green provides a description of Alexander's appearance, based on ancient sources:
Physically, Alexander was not prepossessing. Even by Macedonian standards he was very short, though stocky and tough. His beard was scanty, and he stood out against his hirsute Macedonian barons by going clean-shaven. His neck was in some way twisted, so that he appeared to be gazing upward at an angle. His eyes (one blue, one brown) revealed a dewy, feminine quality. He had a high complexion and a harsh voice.[158]
Many descriptions and statues portray Alexander with the aforementioned gaze looking upward and outward. Both his father Philip II and his brother Philip Arrhidaeus also suffered from physical deformities, which had led to the suggestion that Alexander suffered from a congenital scoliotic disorder (familial neck and spinal deformity). Furthermore, it has been suggested that this may have contributed to his death.[140]
During his last years, sculptor Lysippus sculpted an image of Alexander. Lysippus had captured in the stone Alexander's appearance characteristics; slightly left-turned neck and peculiar gaze. Lysippus' sculpture, which is opposite to his often vigorous portrayal, especially in coinage of the time, is thought to be the most faithful depiction of Alexander.[159]

Personality

Alexander's personality is well described by the ancient sources. Some of his strongest personality traits formed in response to his parents.[158] His mother had huge ambitions for Alexander, and encouraged him to believe it was his destiny to conquer the Persian Empire.[158] Indeed, Olympias may have gone to the extent of poisoning Philip Arrhidaeus so as to disable him, and prevent him being a rival for Alexander.[49] Olympias's influence instilled huge ambition and a sense of destiny in Alexander,[160] and Plutarch tells us that his ambition "kept his spirit serious and lofty in advance of his years".[161] Alexander's relationship with his father generated the competitive side of his personality; he had a need to out-do his father, as his reckless nature in battle suggests.[158] While Alexander worried that his father would leave him "no great or brilliant achievement to be displayed to the world",[12] he still attempted to downplay his father's achievements to his companions.[158]
Alexander's most evident personality traits were his violent temper and rash, impulsive nature,[161][162] which undoubtedly contributed to some of his decisions during his life.[158] Plutarch thought that this part of his personality was the cause of his weakness for alcohol.[161] Although Alexander was stubborn and did not respond well to orders from his father, he was easier to persuade by reasoned debate.[17] Indeed, set beside his fiery temperament, there was a calmer side to Alexander; perceptive, logical, and calculating. He had a great desire for knowledge, a love for philosophy, and was an avid reader.[22] This was no doubt in part due to his tutelage by Aristotle; Alexander was intelligent and quick to learn.[17][158] The tale of his "solving" the Gordian knot neatly demonstrates this. He had great self-restraint in "pleasures of the body", contrasting with his lack of self control with alcohol.[161][163] The intelligent and rational side to Alexander is also amply demonstrated by his ability and success as a general.[162]
Alexander was undoubtedly erudite, and was a patron to both the arts and sciences.[22][161] However, he had little interest in sports, or the Olympic games (unlike his father), seeking only the Homeric ideals of glory and fame.[160][161] He had great charisma and force of personality, characteristics, which made him a great leader.[153][162] This is further emphasised by the inability of any of his generals to unite the Macedonians and retain the Empire after his death – only Alexander had the personality to do so.[153]

Megalomania

During his final years, and especially after the death of Hephaestion, Alexander began to exhibit signs of megalomania and paranoia.[135] His extraordinary achievements, coupled with his own ineffable sense of destiny and the flattery of his companions, may have combined to produce this effect.[164] His delusions of grandeur are readily visible in the testament that he ordered Craterus to fulfil, and in his desire to conquer all non-Greek peoples.[135]
He seems to have come to believe himself a deity, or at least sought to deify himself.[135] Olympias always insisted to him that he was the son of Zeus,[3] a theory apparently confirmed to him by the oracle of Amun at Siwa.[86] He began to identify himself as the son of Zeus-Ammon.[86] Alexander adopted some elements of Persian dress and customs at his court, notably the custom of proskynesis, a practice of which the Macedonians disapproved, and were loath to perform.[103][104] Such behaviour cost him much in the sympathies of many of his countrymen.[104]

Personal relationships


A mural in Pompeii, depicting the marriage of Alexander to Barsine (Stateira) in 324 BC. The couple are apparently dressed as Ares and Aphrodite.
The greatest emotional relationship of Alexander's life was with his friend, general, and bodyguard Hephaestion, the son of a Macedonian noble.[125][158][165] Hephaestion's death devastated Alexander, sending him into a period of grieving.[125][126] This event may have contributed to Alexander's failing health, and detached mental state during his final months.[135][139] Alexander married twice: Roxana, daughter of the Bactrian nobleman Oxyartes, out of love;[166] and Stateira, a Persian princess and daughter of Darius III of Persia, as a matter of political interest.[167] He apparently had two sons, Alexander IV of Macedon of Roxana and, possibly, Heracles of Macedon from his mistress Barsine; and lost another child when Roxana miscarried at Babylon.[168][169]
Alexander's sexuality has been the subject of speculation and controversy.[170] Nowhere in the ancient sources is it stated that Alexander had homosexual relationships, or that Alexander's relationship with Hephaestion was sexual. Aelian, however, writes of Alexander's visit to Troy where "Alexander garlanded the tomb of Achilles and Hephaestion that of Patroclus, the latter riddling that he was a beloved of Alexander, in just the same way as Patroclus was of Achilles".[124] Noting that the word eromenos (ancient Greek for beloved) does not necessarily bear sexual meaning, Alexander may indeed have been bisexual, which in his time was not controversial.[171][172]
Green argues that there is little evidence in the ancient sources Alexander had much interest in women, particularly since he did not produce an heir until the very end of his life.[158] However, he was relatively young when he died, and Ogden suggests that Alexander's matrimonial record is more impressive than his father's at the same age.[173] Apart from wives, Alexander had many more female companions. Alexander had accumulated a harem in the style of Persian kings but he used it rather sparingly;[174] showing great self-control in "pleasures of the body".[163] It is possible that Alexander was simply not a highly sexed person. Nevertheless, Plutarch describes how Alexander was infatuated by Roxanne while complimenting him on not forcing himself on her.[175] Green suggests that, in the context of the period, Alexander formed quite strong friendships with women, including Ada of Caria, who adopted Alexander, and even Darius's mother Sisygambis, who supposedly died from grief when Alexander died.[158]

Legacy

Hellenistic Kingdoms


The Hellenistic world view after Alexander: ancient world map of Eratosthenes (276–194 BC), incorporating information from the campaigns of Alexander and his successors.[176]
Alexander's most obvious legacy was the introduction of Macedonian rule to huge new swathes of Asia. Many of these areas would remain in Macedonian hands or under Greek influence for the next 200–300 years. The successor states that emerged were, at least initially, dominant forces during this epoch, and these 300 years are often referred to as the Hellenistic Period.[177]
The eastern borders of Alexander's empire began to collapse even during his lifetime.[153] However, the power vacuum he left in the northwest of the Indian subcontinent directly gave rise to one of the most powerful Indian dynasties in history. Taking advantage of the neglect shown to this region by the successors, Chandragupta Maurya (referred to in European sources as Sandrokotto), of relatively humble origin, took control of the Punjab, and then with that power base proceeded to conquer the Nanda Empire of northern India.[178] In 305 BC Seleucus, one of the successors, marched to India to reclaim the territory; instead he ceded the area to Chandragupta in return for 500 war elephants. These in turn played a pivotal role in the Battle of Ipsus the result of which did much to settle the division of the Empire.[178]

Hellenization

Hellenization is a term coined by the German historian Johann Gustav Droysen to denote the spread of Greek language, culture, and population into the former Persian empire after Alexander's conquest.[177] That this export took place is undoubted, and can be seen in the great Hellenistic cities of, for instance, Alexandria (one of around twenty towns founded by Alexander[179]), Antioch[180] and Seleucia (south of modern Baghdad).[181] However, exactly how widespread and deeply permeating this was, and to what extent it was a deliberate policy, is debatable. Alexander certainly made deliberate efforts to insert Greek elements into Persian culture and in some instances he attempted to hybridize Greek and Persian culture, culminating in his aspiration to homogenise the populations of Asia and Europe. However, the successors explicitly rejected such policies after his death. Nevertheless, Hellenization occurred throughout the region, and moreover, was accompanied by a distinct and opposite 'Orientalization' of the Successor states.[180][182]

Coin of Alexander bearing an Aramaic language inscription
The core of Hellenistic culture was essentially Athenian by origin.[180][183] The Athenian koine dialect had been adopted long before Philip II for official use and was thus spread throughout the Hellenistic world, becoming the lingua franca through Alexander's conquests. Furthermore, town planning, education, local government, and art current in the Hellenistic period were all based on Classical Greek ideals, evolving though into distinct new forms commonly grouped as Hellenistic.[180] Aspects of the Hellenistic culture were still evident in the traditions of the Byzantine Empire up until the mid-15th century.[184][185]
File:KalashWomenClothing.jpg
Two Kalash women in Hindu Kush. Historians still argue over the legitimacy of the Kalash's claim that they are the direct descendants of Greek settlers.[186]
Some of the most unusual effects of Hellenization can be seen in India, in the region of the relatively late-arising Indo-Greek kingdoms.[187] There, isolated from Europe, Greek culture apparently hybridised with Indian, and especially Buddhist, influences. The first realistic portrayals of the Buddha appeared at this time; they are modelled on Greek statues of Apollo.[187] Several Buddhist traditions may have been influenced by the ancient Greek religion: the concept of Boddhisatvas is reminiscent of Greek divine heroes,[188] and some Mahayana ceremonial practices (burning incense, gifts of flowers, and food placed on altars) are similar to those practiced by the ancient Greeks. Zen Buddhism draws in part on the ideas of Greek stoics, such as Zeno.[189] One Greek king, Menander I, probably became Buddhist, and is immortalized in Buddhist literature as 'Milinda'.[187]

Influence on Rome

Alexander and his exploits were admired by many Romans who wanted to associate themselves with his achievements. Polybius started his Histories by reminding Romans of his role, and thereafter subsequent Roman leaders saw him as his inspirational role model. Julius Caesar reportedly wept in Spain at the sight of Alexander's statue, because he thought he had achieved so little by the same age that Alexander had conquered the world.[190] Pompey the Great searched the conquered lands of the east for Alexander's 260-year-old cloak, which he then wore as a sign of greatness. In his zeal to honor Alexander, Augustus accidentally broke the nose off the Macedonian's mummified corpse while laying a wreath at the Alexander's tomb Alexandria. The Macriani, a Roman family that in the person of Macrinus briefly ascended to the imperial throne, kept images of Alexander on their persons, either on jewelry, or embroidered into their clothes.[191]
In the summer of 1995, a statue of Alexander was recovered in an excavation of a Roman house in Alexandria, which was richly decorated with mosaic and marble pavements and probably was constructed in the 1st century AD and occupied until the 3rd century.[192]

Legend

There are many legendary accounts surrounding the life of Alexander the Great, with a relatively large number deriving from his own lifetime, probably encouraged by Alexander himself. His court historian Callisthenes portrayed the sea in Cilicia as drawing back from him in proskynesis. Writing shortly after Alexander's death, another participant, Onesicritus, went so far as to invent a tryst between Alexander and Thalestris, queen of the mythical Amazons. When Onesicritus read this passage to his patron, Alexander's general and later King Lysimachus reportedly quipped, "I wonder where I was at the time."[193]
In the first centuries after Alexander's death, probably in Alexandria, a quantity of the more legendary material coalesced into a text known as the Alexander Romance, later falsely ascribed to the historian Callisthenes and therefore known as Pseudo-Callisthenes. This text underwent numerous expansions and revisions throughout Antiquity and the Middle Ages.[194]

In ancient and modern culture

Alexander the Great's accomplishments and legacy have been preserved and depicted in many ways. Alexander has figured in works of both high and popular culture from his own era to the modern day.
In Punjab, the land of his final conquest, the name "Secunder" is commonly given to children even today. This is both due to respect and admiration for Alexander and also as a memento to the fact that fighting the people of Punjab fatigued his army to the point that they revolted against him.
A common proverb in the Punjab reads jit jit key jung, secunder jay haar, in translation, "Alexander wins so many battles that he loses the war". It is used to address anyone who is good at winning but never takes advantage of those wins.[citation needed]

Sources

Texts written by people who actually knew Alexander or who gathered information from men who served with Alexander are all lost apart from a few inscriptions and fragments. Contemporaries who wrote accounts of his life include Alexander's campaign historian Callisthenes; Alexander's generals Ptolemy and Nearchus; Aristobulus, a junior officer on the campaigns; and Onesicritus, Alexander's chief helmsman. These works have been lost, but later works based on these original sources survive. The five main surviving accounts are by Arrian, Curtius, Plutarch, Diodorus, and Justin.[195]