Antigonid dynasty at English => English (The Britannica Concise) Of Explained:
Ruling house of ancient Macedonia (300-168 BC). Antigonus I was proclaimed king in 306 BC after his son Demetrius conquered Cyprus, thus giving his father control of the Aegean, the E 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 E Mediterranean. The defeat of his successor, Perseus, at Pydna in 168 BC marked the end of the dynasty.