Pyrrhus, king of Epirus, and kinsman of Alexander the Great; essayed to emulate the Macedonian by conquering the western World, and in 280 B.C. invaded Italy with a huge army, directed to assist the Italian Greeks against Rome; in the decisive battles of that year and the next, he won "Pyrrhic victories" over the Romans, losing so many men that he could not pursue his advantage; 278 to 276 he spent helping the Greek colonies in Sicily against Carthage; his success was not uniform, and a Carthaginian fleet inflicted a serious defeat on his fleet returning to Italy; in 274 he was thoroughly vanquished by the Romans, and retired to Epirus; subsequent wars against Sparta and Argos were marked by disaster; in the latter he was killed by a tile thrown by a woman (318-272 B.C.).

Pyrrhus, called also Neoptolemus, son of Achilles; was one of the heroes concealed in the wooden horse by means of which Troy was entered, slew Priam by the altar of Zeus, and sacrificed Polyxena to the manes of his father. Andromache, the widow of Hector, fell to him on the division of the captives after the fall of Troy, and became his wife.