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Pyrrhus (/ ˈ p ɪr ə s / PIRR -əss; Greek: Πύρρος Pýrrhos; 319/318–272 BC) was a Greek king and statesman of the Hellenistic period. He was king of the Molossians, of the royal Aeacid house, and later he became king (Malalas also called him toparch) of Epirus. He was one of the strongest opponents of early Rome, and had been regarded as one of the greatest generals of antiquity. Several of his victorious battles caused him unacceptably heavy losses, from which the term " Pyrrhic victory " was coined.

Pyrrhus became king of Epirus in 306 BC at the age of 13, but was dethroned by Cassander four years later. He saw action during the Wars of the Diadochi and regained his throne in 297 BC with the support of Ptolemy I Soter. During what came to be known as the Pyrrhic War, Pyrrhus fought Rome at the behest of Tarentum, scoring costly victories at Heraclea and Asculum. He proceeded to take over Sicily from Carthage but was soon driven out, and lost all his gains in Italy after the Battle of Beneventum in 275 BC.

Pyrrhus seized the Macedonian throne from Antigonus II Gonatas in 274 BC and invaded the Peloponnese in 272 BC. The Epirote assault on Sparta was thwarted, however, and Pyrrhus was killed during a street battle at Argos.