Quintus Lutatius Catulus
In 78 BC, Brutus was stationed as a commander in Cisalpine Gaul. He was allied with Marcus Aemilius Lepidus, who as consul was agitating against Sulla's constitutional settlement and opposed a state funeral for the dictator after his death. He also "took up the cause of those who had lost their civil or political rights under Sulla's reforms". Lepidus turned to violence and raised an army against his consular colleague Quintus Lutatius Catulus when Catulus successfully blocked constitutional reform.