several different fronts, Gratian, now senior augustus following Valens's death, appointed Theodosius I augustus on 19 January 379 to govern the east. Theodosius the Elder, who had died in 375, was then deified . On 3 August that year, Gratian issued an edict against heresy. In 380, Gratian was made consul for the fifth time and Theodosius for the first. In September the augusti Gratian and Theodosius met, returning the Roman diocese of Dacia to Gratian's control and that of Macedonia to Valentinian II. The same year, Gratian won a victory, possibly over the Alamanni, that was announced officially at Constantinople. In the autumn of 378 Gratian issued an edict of religious toleration. By 380, the Greuthungi tribe of Goths moved into Pannonia, only to be defeated by Gratian. Consequently, the Vandals and Alemanni were threatening to cross the Rhine, now that Gratian had departed from the region. With the collapse of the Danube frontier under the incursions of the Huns and Goths, Gratian moved his seat from Augusta Treverorum (Trier) to Mediolanum (Milan) in 381, and was increasingly aligned with the city's bishop, Ambrose (374–397), and the Roman Senate, shifting the balance of power within the factions of the western empire. Under the influence of Ambrose, bishop of Mediolanum (Milan), took active steps against pagan worship. On 27 February 380, Gratian, Valentinian II, and Theodosius issued the Edict of Thessalonica. This edict made Nicene Christianity the only legal form of Christianity and outlawed all other forms of religion. This brought to an end a period of widespread religious tolerance that had existed since the death of Julian. Gratian was then forthright in his promotion of Nicene Christianity. He ordered the removal of the Altar of Victory from the Roman Senate's Curia Julia in the winter of 382/383. State endowments for pagan cults were cancelled. According to the late 5th/early 6th-century Greek historian Zosimus, Gratian refused the robe of office of the pontifex maximus, though this story is not creditable, because no such garment was associated with the priesthood. According to the Consularia Constantinopolitana, Gratian's father's remains were eventually interred in the Mausoleum of Constantine, to which the Church of the Holy Apostles was attached, on 21 February 382, beside those of his first wife and the mother of Gratian, Marina Severa. In 382, Gratian issued edicts that removed the statue of the winged goddess Victory from the Senate floor,