The Diocese of the Seven Provinces (Latin: Dioecesis Septem Provinciarum), originally called the Diocese of Vienne (Latin: Dioecesis Viennensis) after the city of Vienna (modern Vienne), was a diocese of the later Roman Empire, under the praetorian prefecture of Gaul. It encompassed southern and western Gaul (Aquitania and Gallia Narbonensis), that is, modern France south and west of the Loire, including Provence. The diocese comprised the following provinces: Aquitanica I, Aquitanica II, Novempopulana (Aquitanica III), Narbonensis I, Narbonensis II, Viennensis and Alpes Maritimae