Valentinian II
Following his landing in Gaul, Maximus went out to meet Gratian, whom he defeated after five days skirmishing near Paris. Gratian fled and was killed at Lyon on 25 August 383. Continuing his campaign into Italy, Maximus was stopped from overthrowing Valentinian II, who was only twelve, when Flavius Bauto came with a powerful force to forestall him. Negotiations followed in 384 including the intervention of Ambrose, Bishop of Milan, leading to an accord with Valentinian II and Theodosius I in which Maximus was recognized as Augustus in the West.