Valentinian II
When the usurper Magnus Maximus invaded Italy in an attempt to replace Valentinian II, Bauto led military defence against him. According to bishop Ambrose, Maximus accused Bauto of attacking him with barbarian troops and intending to establish a puppet emperor in the figure of Valentinian II to acquire sovereignty for himself. In matters of religion, Bauto was likely a Christian. He and Rumoridus, who was pagan, were present before Valentinian when Ambrose successfully convinced the emperor against Symmachus' proposal to restore the pagan Altar of Victory, which had been earlier removed from the senate of Rome. Afterwards, the two men went along with Valentinian's decision.