1911 Encyclopædia Britannica/Philip III., king of Macedonia

PHILIP III. [Arrhidaeus], king of Macedonia, was the feeble-minded son of Philip II. of Macedonia by a Thessalian wife. He was chosen by the Macedonian army at Babylon in 323 to be nominal king conjointly with the infant Alexander, and was killed in Macedonia by order of Olympias (317). (See Macedonian Empire.)