Upon Philip's death in Macedon (179 BC), his son, Perseus of Macedon, attempted to restore Macedon's international influence, and moved aggressively against his neighbors. When Perseus was implicated in an assassination plot against an ally of Rome, the Senate declared the third Macedonian War. Initially, Rome did not fare well against the Macedonian forces, but in 168 BC, Roman legions smashed the Macedonian phalanx at the Battle of Pydna. Perseus was later captured and the kingdom of Macedon divided into four puppet republics that Rome controlled.

Macedonian Wars -  Wikipedia, the free encyclopedia