Alexander the Great was a king of the Greek kingdom of Macedon. Born in Pella in 356 BC, Alexander succeeded his father, Philip II, to the throne at the age of twenty. He spent most of his ruling years on an unprecedented military campaign through Asia and northeast Africa, until by the age of thirty he had created one of the largest empires of the ancient world, stretching from Greece to Egypt and into present-day Pakistan. He was undefeated in battle and is considered one of history's most successful commanders.