Third Macedonian War
In 179 BC Philip died and his talented and ambitious son, Perseus of Macedon, took his throne and showed a renewed interest in Greece. He also allied himself with the warlike Bastarnae, and both this and his actions in Greece possibly violated the treaty signed with the Romans by his father or, if not, certainly was not "behaving as [Rome considered] a subordinate ally should". Rome declared war on Macedonia again, starting the Third Macedonian War. Perseus initially had greater military success against the Romans than his father, winning the Battle of Callicinus against a Roman consular army. However, as with all such ventures in this period, Rome responded by simply sending another army. The second consular army duly defeated the Macedonians at the Battle of Pydna in 168 BC and the Macedonians, lacking the reserve of the Romans and with King Perseus captured, duly capitulated, ending the Third Macedonian War.