Roman expansion alarmed Tarentum, the leading city of the Greek presence (Magna Graecia) in southern Italy. They hired the mercenary, King Pyrrhus of Epirus, in neighboring Greece to fight the Romans on their behalf. In 280 BC the Romans suffered a defeat at the hands of Pyrrhus at the Battle of Heraclea on the coast west of Tarentum. The battle was costly for both sides, prompting Pyrrhus to remark "One more such victory and I am lost." Making the best of it, the Roman army turned on Greek Rhegium and effected a massacre of Pyrrhian partisans there.