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Alexander the Great (356-323 BC) was probably the greatest general of all time, and his conquests and brief reign changed the history of the world. Once the great Macedonian had dreamt of a universal Empire that encompassed the known world. However, the realm that he created did not long survive was short lived and quickly fragmented. Within a few years of his death, Macedonian generals had divided his territories into some different various Hellenistic states. Several factors caused the sudden collapse of the Empire that Alexander built. These include the early and the rather unexpected death of the great king, absence of a capable successor, rebellious generals, and the sheer extent size of the territoriesAlexander had invaded. Instead of creating a vast empire, all meant that the vast Empire Alexander's dream collapsed into a series of numerous warring kingdoms.

Alexander the Great became king of Macedonia after the death of his father, Phillip II. He had inherited a powerful kingdom and a full an overflowing treasury, but above all, he had inherited took control of the Macedonian army which often regarded by scholars as among the greatest one best fighting forces in the history of warfare. After putting down a rebellion in Greece and securing Macedonia’s frontiers, he launched an invasion of the Achaemenid Persian Empire, which spanned much of Western Asia. He claimed that he was waging a war of revenge in retaliation for the two previous Persian invasions of Greece.<ref> Arrian, Campaigns of Alexander, I, 56</ref>

At the battle of Gaugamela, he utterly defeated wrecked Darius II 's army and went on proceded to annex all of Persia. The Macedonian monarch pursued Darius II into Central Asia, who but failed to capture him before he was later assassinated by one of his generals. Alexander’s conquests provided a great administrative challenge, and he adopted the Persian system of satrapies or semi-autonomous territorial units, which were ruled by his Macedonian lieutenant. He also chose a conciliatory policy towards the Persians, as evidenced by his treatment of the family of Darius’Darius.<ref> Plutarch. Life of Alexander, v, ix</ref>

The generals in the army soon usurped control of the Empire. They at first agreed to cooperate and to hold together the Empire together in the name of Alexander’s brother who was crowned King Phillip III. Alexander’s infant son from his wife Roxana was made co-ruler with Phillip III after his birth. The royal family was sent to Macedonia to the royal capital at Pella. The great general Perdiccas was the Regent, and he was technically the supreme commander of the army. Immediately there were problems, and the because Macedonian generals began to pursue their own interests and formed private armies. There were several conspiracies involving members of the dead king’s extended family.

Moreover, many of the generals became suspicious of Perdiccas who seemed appeared to be seeking to make elevate himself sole ruler of the Empire to emperor of Alexander's kingdom.<ref> Hornblower, Simon, and Spawforth, Tony. Who's Who in the Classical World (Oxford, Oxford University Press, 2000), p. 238 </ref> This led to the first War of the Diadochi or Successors of Alexander. By 321 AD , Ptolemy the satrap of Egypt was acting like an independent ruler, and when he . Ptolemy then seized the Alexander's body of Alexander, it which was seen perceived as an attempt to make annoint himself the great general’s as Alexander’s heir. Perdiccas attempted to invade Egypt, but he bungled the crossing of the Nile, and his generals later assassinated him. Antigonus defeated Eumenes, who had regarded himself as the successor of Perdiccas and he became the most powerful ruler in the lands conquered by Alexander.<ref> Hornblower and Spawforth, p. 167</ref>

However, much of the Empire was outside of his control, and Antigonus sought to reunite all the lands that had been formerly controlled, conquered by the greatest Macedonian kingAlexander. There were three more civil wars, between the successors of Alexander that ravaged an area from Greece to Central Asia. At this time, Seleucus was forced to concede, the satrapies in India to the rising regional superpower the Mauryan kingdom. The fourth Diadochi war was decided at the Battle of Ipsus (301 AD). Here Antigonus was defeat by a coalition led by Seleucus. <Hornblower and Spawforth, p 189</ref>  The aftermath of the battle was the final partition of the Macedonian Empire. There were no further attempts to reunify the lands conquered by Alexander the Great. After some more wars, by 280 BC, Alexander’s conquests were finally divided between the Seleucids in Asia, the Ptolemies in Egypt, and the Antigonids in Macedonia. These kingdoms proved durable, and the successor states endured for roughly 200 years.

The sudden removal of this pivotal figure allowed ambitious individuals to pursue their own interestsat the expense of the greater Empire. The death of Alexander meant that the army did not have a single leader. Rival generals ignored their superiors and followed their interests, and this was to the detriment of the unity of the Empire. Immediately after the death of Alexander, at the Compromise of Babylon, which prevented a civil war, the generals divided the conquests into their respective spheres of influence.<ref>Shipley, Graham. The Greek World After Alexander. Routledge History of the Ancient World. (Routledge, New York, 2000), p 113</ref>

Remarkably while While Alexander left a will, ordering further conquest and ambitious construction projects , he did not failed to state who should succeed him and wear the crown. The death of Alexander meant that his throne and all his realms should have passed to his heir.<ref> Shipley, p 17 </ref> This was far from straightforward. He had an infant son , but he was declared to be illegitimate. His lawful wife was pregnant, but it was not certain if the baby would live or if it would be a male.

Under Macedonian succession law , only males could be crowned. However, his half-brother was alive and was in his twenties. Under the Compromise of Babylon, he was recognized as Philip III Arrhidaeus. He had accompanied Alexander on all his campaigns and was present at his death. Phillip appears to have had some intellectual disability and was not capable of ruling. He soon became the pawn of the generals and especially Perdiccas. When Roxanne, Alexander’s wife gave birth to a boy, he was named as Alexander IV of Macedonia. Perdiccas sent them to Pella where they were held as virtually virtual prisoners. The real power lay now with the generals , and the heirs of Alexander were only puppets. Phillip III and Alexander IV were both assassinated and with them ended the line of Alexander.

The lack of an able and mature successor meant that the Empire was almost bound to fall into a state of civil war. When there was no clear succession plan in kingdoms in the ancient world instability inevitably followed the death of the monarch. Without a strong king at the head of the army and the state, power fell into the hands of the strongest , and these were the generals. They had become very ambitious, even during the lifetime of Alexander. Many of them when they served as satrapies often acted like independent monarchs. The lack of a ruler meant that power passed to the generals and they began a series of power struggles that caused the unified Empire of Alexander to fragment into a series of different successor states.<ref>Shipley, p 15</ref>

The early death of Alexander and the absence of any heir that could control the ambitions of the generals and others, were very important crucial factors in the disintegration of the Empire. However, there are those who argue that even if there had been an orderly succession and the army had remained united that it would have fragmented in due course. The sheer extent of Alexander’s realm is estimated to have been 2 million square miles (5 million kilometreskilometers). Communications at the time were very slow and, furthermore, the Macedonian Empire was very diverse and divided by religion, ethnicity, and language.  Alexander had the charisma and authority to impose his will on the regions. However, even he had to give a great deal of autonomy to his governors and was troubled by rebellious satraps <ref> Arrian, 5, 78</ref>. The vast Empire would have been very hard to keep together even had the great conqueror lived and had a capable successor. Once he died, there was no central authority to maintin unity. The scale of the territories was such that it was almost impossible to govern effectively. Instead, local military leaders often usurped entire provinces with impunity and became de-facto independent. This repeated itself with Ptolemy in Egypt, Seleucus in Babylon and Lysimachus in Thrace.

Alexander had the charisma and authority to impose his will on the regions. However, even he had to give a great deal of autonomy to his governors and was troubled by rebellious satraps <ref> Arrian, 5, 78</ref>. The vast Empire would have been very hard to keep together even had the great conqueror lived and had a capable successor. Once he died there was no central authority to keep the territories united. The scale of the territories was such that it was almost impossible to effectively govern. This meant that local military leaders often usurped entire provinces with impunity and became de-facto independent. This was the case with Ptolemy in Egypt, Seleucus in Babylon and Lysimachus in Thrace. The sheer scale of the conquests of Alexander allowed generals to carve out often vast states. Moreover, the regions required these local strongmen, who could deal with issues on the spot. Only they could maintain order and defend the frontiers because any central authority would have been too far away and distant.<ref>Green, Peter. Alexander to Actium: The Historical Evolution of the Hellenistic Age (Berkeley, University of California Press, 1990), p 113</ref> The need for these strong local rulers was another factor in the break-up of one of the largest Kingdoms in world history.