Antigonus III Doson (263 BC-221 BC), king of Macedonia 229 BC-221 BC.
He belonged to the Antigonid dynasty.
Antigonus was the nephew of Antigonus II Gonatas. On death of Demetrius II of Macedon (229 BC) Antigonus made guardian on Demetrius II son Philip. In 227 BC Antigonus married widow of Demetrius II, Phthia, deposing the young Philip, and became king.
Antigonus supported Aratus Of Sicyon and the Achaean League against Aetolian League and Cleomenes III, king of Sparta. Antigonus defeated Cleomenes III in Battle of Sellasia, 222 BC.
