While the Greek states exhausted themselves in endless conflicts, the new power of Macedonia arose in the north. The kings of Macedonia slowly built up their power over rival states, and in 359 B.C.E., the brilliant and cultured Philip II ascended to the throne. With decades of effort he secured the borders of Macedonia against invaders from the north, and he then launched a series of military operations in the northwestern Aegean. By clever use of his wealth and superb army, he gained control of the area, and in 338 B.C.E., he won a decisive victory over Thebes and Athens that gave him command of Greece. Because the Greeks could not put aside their quarrels, they fell to an invader, and 338 B.C.E. is often seen as marking the end of the classical period.

After his victory, Philip led a combined army of soldiers from Macedonia and from many Greek states in an attempt to liberate the Ionian Greeks from Persian rule. Before he could launch this campaign, however, Philip fell to an assassin’s dagger in 336 B.C.E. His young son Alexander vowed to carry on Philip’s mission. He would succeed beyond all expectations.