Kammala jumla mai zuwa: Kafin 54 BC, wataƙila zuriyar ƙabilar Gallic ta zauna a Biritaniya. Bayan da
Roman mamayewa na Birtaniya, uku "civitates" aka halitta a cikin marigayi 1st c. BC: daya daga cikin Atrebates, tare da babban birnin a Calleva Atrebatum (Silchester); daya daga cikin Belgae tare da babban birninsa a Venta Belgarum (Winchester); da kuma daya daga cikin Reg ((i) ni, tare da babban birnin a Noviomagus Reginorum (Chichester).