After Philip became the ruler of the whole of Greece (except, perhaps, of Sparta), he convened a congress of all the Greek city of Corinth in 337 BC. Congress theme – a war with Persia. The Congress elected the Greeks Philip Supreme Commander of all the Greek forces and voted for the war with Persia. In 336 BC Macedonia began the war with the Achaemenid Empire. In Asia Minor, was sent to the vanguard of the Macedonian army led by Parmenion and Attalia, who managed to cross the Hellespont and to gain a foothold on the opposite bank. But at this crucial time, Philip was assassinated at the wedding of his daughter. The circumstances of the murder remained unsolved, and historians disagree about motives of murder so far.
After the murder of Philip of Greece became alive and started to act aggressively antimakedonskaya party. The enemies of Macedonia, were sure that everything goes as usual. So it was before and after the murder of Thessaly Jason and Caria after the death of Mausolus. Many thought that with the death of Philip of Macedonia will take the glory. When news of the death of Philip reached Athens, Demosthenes appeared in the Athens meeting of the Council's formal attire and with a wreath on his head. Demosthenes congratulated on the death of Philip, and uttered the phrase – 'Well, this little boy, Alexander, we are not afraid. " Raised their heads and threatened Macedonia falling away all the conquered tribes. In the Macedonian army, which landed in Malaya Asia also began excitement. However, becoming king at age twenty, Alexander began to act as vigorously and without hesitation, like his father. In Macedonia, he quickly spent the punishment of those who might challenge his right to the throne, as well as in the army, where mature rebellion. Then, the Macedonian army quickly invaded Greece, where Alexander renewed a contract with the Union of Athens.