Alexander III of Macedon (20/21 July 356 – 10/11 June 323 BC), commonly known as Alexander the Great (Greek: , Mégas Aléxandros), was a king of Macedon (Greek: ), a state in the north eastern region of Greece, and by the age of thirty was the creator of one of the largest empires in ancient history, stretching from the Ionian sea to the Himalaya. He was undefeated in battle and is considered one of the most successful commanders of all time. Born in Pella in 356 BC, Alexander was tutored by the famed philosopher Aristotle. In 336 BC he succeeded his father Philip II of Macedon to the throne after Philip was assassinated. Philip had brought most of the city-states of mainland Greece under Macedonian hegemony, using both military and diplomatic means.