wikipediaGratian (/ˈɡreɪʃən/; Latin: Flavius Gratianus Augustus;[1] Greek: Γρατιανός; 18 April/23 May 359 – 25 August 383) was Roman emperor from 367 to 383. The eldest son of Valentinian I, Gratian accompanied, during his youth, his father on several campaigns along the Rhine and Danube frontiers. Upon the death of Valentinian in 375, Gratian's brother Valentinian II was declared emperor by his father's soldiers. In 378, Gratian's generals won a decisive victory over the Lentienses, a branch of the Alamanni, at the Battle of Argentovaria. Gratian subsequently led a campaign across the Rhine, the last emperor to do so, and attacked the Lentienses, forcing the tribe to surrender. That same year, his uncle Valens was killed in the Battle of Adrianople against the Goths. He favoured Christianity over traditional Roman religion, refusing the office of Pontifex maximus and removing the Altar of Victory from the Roman Senate.