The Diocese of Bazas, centred on Bazas in Aquitaine, covered the Bazadais region, known under the Romans as the Vasatensis pagus after the ancient occupants, the Vasates. In the 2nd century it was part of the Novempopulania, one of the seventeen provinces of Gaul. The diocese must have been created between the first and the third centuries, but because of the large numbers of invaders that passed through this region - Arians, Saracens, Normans - the list of bishops is much reduced during the first millennium. The first bishop of this diocese is mentioned, without a name, by Gregory of Tours in his De gloria martyrum.