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King of Macedonia and Conqueror of the Persian Empire. Alexander III the Great, the King of Macedonia and conqueror of the Persian Empire is considered one of the greatest military geniuses of all times. He was inspiration for later conquerors such as Hannibal the Carthaginian, the Romans Pompey and Caesar, and Napoleon.
How did Alexander the Great build his empire? Alexander the Great became king after his father, King Phillip II, died. Alexander began his conquest of the Persian Empire 334 B.C. with the Battle of Granicus. Alexander's forces destroyed the Persian forces. A year later, Alexander the Great, defeated the Persian army at the Battle of Issus and freed the Greek city-states of Asia Minor. He then captured Syrian and Egypt. Alexander built the city of Alexandria in Egypt as a center of business.