Quintus Lutatius Catulus (149–87 BC) was a consul of the Roman Republic in 102 BC. His colleague in the consulship was Gaius Marius. During their consulship the Cimbri and Teutones marched south again and threatened the Republic. While Marius marched against the Teutones in Gaul, Catulus had to keep the Cimbri from invading Italy. In this he failed; the Cimbri succeeded in invading the Po Valley. In 101 BC, as proconsul, he helped Marius defeat the Cimbri at Vercellae. After Vercellae the two feuded and Catulus sided with Sulla in the civil war of 88–87 BC. When the Marians regained control of Rome in 87 BC, Catulus committed suicide rather than face prosecution.