Gratian (; ; 18 April 359 – 25 August 383) was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian accompanied his father on several campaigns along the Rhine and Danube frontiers and was raised to the rank of Augustus in 367. Upon the death of Valentinian in 375, Gratian took over government of the west while his half-brother Valentinian II was also acclaimed emperor in Pannonia. Gratian governed the western provinces of the empire, while his uncle Valens was already the emperor over the east. Gratian subsequently led a campaign across the Rhine, attacked the Lentienses, and forced the tribe to surrender. That same year, the eastern emperor Valens was killed fighting the Goths at the Battle of Adrianople, which led to Gratian elevating Theodosius to replace him in 379. Gratian favoured Nicene Christianity over traditional Roman religion, issuing the Edict of Thessalonica, refusing the office of pontifex maximus, and removing the Altar of Victory from the Roman Senate's Curia Julia. The city of Cularo on the Isère river in Roman Gaul was renamed after him, which later evolved to Grenoble. In 383, faced with rebellion by the usurper Magnus Maximus, Gratian marched his army towards Lutetia (Paris). His army deserted him. He fled to Lugdunum and was later murdered. Early life According to the Chronicle of Jerome and the Chronicon Paschale, Valentinian's eldest son Gratian was born on 18 April 359 at Sirmium, now Sremska Mitrovica in Serbia, the capital of Pannonia Secunda, to Valentinian's first wife Marina Severa. Gratian was his parents' only son together. At the time of his birth Gratian's father was living in exile. Gratian was named after his grandfather Gratianus, who was a tribune and later comes of Britannia for Constantine the Great (). Following the death of the emperor Jovian (), on 26 February 364, Valentinian was proclaimed Augustus (emperor). Within a month, motivated by senior officers, he proclaimed his brother Valens, Gratian's uncle, Augustus of the Eastern empire. Gratian was appointed consul in 366 and was entitled nobilissimus puer by his father. Gratian was seven when entitled nobilissimus puer, which indicated he was to be proclaimed Augustus. Gratian's tutor was the rhetor Ausonius, who mentioned the relationship in his epigrams and a poem. Reign In summer 367, Valentinian became ill at Civitas Ambianensium (Amiens), raising questions about his succession. On recovery, he presented