Ancient Greek bronze coin of Philip III Arrhidaios son of King Philip II of MacedonKings of Macedon. Philip III Arrhidaios AE Bronze 323 317 BC Size: 15mm Weight: 4. 39 grams Obverse: Macedonian shield with boss Rev: B A, Macedonian helmet, grain ear to left. Ref: Price 2807 Philip III Arrhidaeus was king of the ancient Greek kingdom of Macedonia from 323 until his execution in 317 BC. He was a son of King Philip II of Macedon by Philinna of Larissa, and thus an elder half brother of Alexander the Great. Named Arrhidaeus at birth,