A few years later, in 474 BC, Syracuse's tyrant Hiero defeated the Etruscans at the Battle of Cumae. Etruria's influence over the cities of Latium and Campania weakened, and it was taken over by Romans and Samnites. In the 4th century, Etruria saw a Gallic invasion end its influence over the Po valley and the Adriatic coast. Meanwhile, Rome had started annexing Etruscan cities. This led to the loss of their north provinces. Etruscia was assimilated by Rome around 500 BC.