King of Macedonia, son of Demetrius II. and Chryseïs; an infant at his fathers death in 230229. His cousin, Antigonus Doson, administered the kingdom as regent till his death in 221220, when Philip was eighteen years old. Philip now ascended the throne and reigned till 179. His reign was occupied in the vain struggle to maintain the old Macedonian supremacy in the Balkan Peninsula, which became hopeless after the intervention of Rome and the decisive battle of Cynoscephalae (197).