(306–168) Ruling house of ancient Macedonia. Antigonus I was proclaimed king in 306 BC after his son Demetrius conquered Cyprus, thus giving his father control of the Aegean, the eastern Mediterranean, and most of the Middle East. Under Demetrius II (r. 239–229 BC), Macedonia was weakened by war with the Greek Achaean and Aetolian leagues. Antigonus III (d. 221) reestablished the Hellenic Alliance, restoring Macedonia to a strong position in Greece. Under Philip V, Macedonia first clashed with Rome, in 215. Philip's defeat upset the old balance of power, and Rome became the decisive force in the eastern Mediterranean. The defeat of his successor, Perseus, at Pydna in 168 BC marked the end of the dynasty.
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