Alexander the Great (Greek: Αλέξανδρος ο Μέγας or Μέγας Aλέξανδρος, Megas Alexandros; July 20 356 BC – June 10 323 BC), also known as Alexander III, was an ancient Greek king (basileus) of Macedon (336–323 BC). He was one of the most successful military commanders in history, and was undefeated in battle. By the time of his death, he had conquered most of the world known to the ancient Greeks.
Following the unification of the multiple city-states of ancient Greece under the rule of his father, Philip II of Macedon (a labour Alexander had to repeat because the southern Greeks rebelled after Philip's death), Alexander conquered the Achaemenid Persian Empire, including Anatolia, Syria, Phoenicia, Judea, Gaza, Egypt, Bactria and Mesopotamia and extended the boundaries of his own empire as far as the borders of Punjab. Before his death, Alexander had already made plans to also turn west and conquer Europe. He also wanted to continue his march eastwards in order to find the end of the world, since his boyhood tutor Aristotle had told him tales about where the land ends and the Great Outer Sea begins. Alexander integrated foreigners into his army, leading some scholars to credit him with a "policy of fusion." He encouraged marriage between his army and foreigners, and practised it himself. After twelve years of constant military campaigning, Alexander died, possibly of malaria, West Nile virus, typhoid fever, viral encephalitis or the consequences of heavy drinking..
His conquests ushered in centuries of Greek settlement and cultural influence over distant areas, a period known as the Hellenistic Age, a combination of Greek and Middle Eastern culture. Alexander himself lived on in the history and myth of both Greek and non-Greek cultures. After his death (and even during his life) his exploits inspired a literary tradition in which he appears as a legendary hero in the tradition of Achilles.