Philip II of Macedon (, ; 382 – 21 October 336 BC) was the king (basileus) of the kingdom of Macedon from 359 BC until his assassination in 336 BC. He was a member of the Argead dynasty of Macedonian kings, the third son of King Amyntas III of Macedon, and father of Alexander the Great and Philip III. The rise of Macedon, its conquest and political consolidation of most of Classical Greece during the reign of Philip II was achieved in part by his reformation of the Ancient Macedonian army, establishing the Macedonian phalanx that proved critical in securing victories on the battlefield. After defeating the Greek city-states of Athens and Thebes at the Battle of Chaeronea in 338 BC, Philip II led the effort to establish a federation of Greek states known as the League of Corinth, with him as the elected hegemon and commander-in-chief of Greece for a planned invasion of the Achaemenid Empire of Persia. However, his assassination by a royal bodyguard, Pausanias of Orestis, led to the immediate succession of his son Alexander, who would go on to invade the Achaemenid Empire in his father's stead.