Antipater I of Macedon (Greek: Ἀντίπατρος), was the son of Cassander and Thessalonike of Macedon, who was a half-sister of Alexander the Great. He was king of Macedon from 297 BC until 294 BC, jointly with his brother Alexander V. Eventually, he murdered his mother and ousted his brother from the throne. Alexander turned to Pyrrhus and Demetrius I Poliorcetes for help, and Demetrius I overthrew Antipater and then had Alexander murdered. Antipater was killed by Lysimachus, after he fled from Demetrius I to Thrace. His wife was Eurydice, his paternal cousin who was a daughter of Lysimachus. He and his brother were the last kings of Macedon to be descended from Perdiccas I. References External links Justinus's account of the killing of Antipater I Plutarch's account of the ousting of Antipater I 3rd-century BC Macedonian monarchs Ancient Macedonian monarchs 3rd-century BC rulers Murdered royalty of Macedonia (ancient kingdom) Year of birth unknown Matricides 3rd-century BC Greek people 4th-century BC births 3rd-century BC deaths Antipatrid dynasty zh:安提帕特二世