Alexander III of Macedon is dubbed as one of the greatest leaders of all time. He was the Greek king of Macedon. He was a student of Aristotle and by the time he was 30, had created one of the biggest empires of the ancient world, and quite possibly one of the biggest. He is also considered one of the greatest commanders as he was undefeated from battle. He became a pharaoh of Egypt, the king of Persia and the king of Asia.