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[[File: Alex One.jpg|
200px|thumb|left| Alexander the Great]]__NOTOC__
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 and quickly fragmented. Within a few years of his death, Macedonian generals had divided his territories into some different 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 of the territories, all meant that the vast Empire collapsed into a series of warring kingdoms.