Alexander the Great was born in Pella, Macedon in 356 BC and was tutored by Aristotle. He became king at age 19 after his father's death and embarked on a military career conquering Thebes and establishing Alexandria in Egypt. From 334-323 BC, Alexander conquered the massive Persian Empire and expanded his empire as far as modern day Pakistan. However, upon his death at age 33, his empire quickly fell apart due to lack of clear succession plans and leadership of his ability.