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.
A Roman era boundary marker has been found near Neidenbach bei Kyllburg marked "FINIS PAGI CARV CVM" (the boundary or end of the Carucum pagus).
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The Caeroesi appear to have lived in the south of this range, in the Eifel region, in the area which later because the Roman pagus of Carucum, a sub-division of the Treveri.
Some of them (laeti) were also settled in France pagus attuariorum (French; Atuyer, comprising Oscheret at that time) south of Langres in the 3rd century.
The original pagus comprised the territories of Garrotxa and those neighbouring Montgrony and Setcases in the comarca of Ripollès as far as Agullana and Figueres (in Alt Empordà) and Banyoles in Pla de l'Estany.
The Valle de Lord was attached to the County of Urgell and the pagus of Berga (Berguedà) to the County of Cerdanya, but the region of the Ripollès, the Lluçanès, the Plana de Vic, and the Guilleries were structured around the city of Ausa, a region which in ancient times had been ethnically distinct, inhabited by the Ausetani.
Between Monte Antico and Monte Capraro was a Pagus Collis Nisii or Collenisyus ("Hill of Bacchus") where the escaped from Usconium were sheltered after its destruction by the Goths.