Before 54 BC, an offshoot of the Gallic tribe probably settled in Britain. After the Roman invasion of Britain, three "civitates" were created in the late 1st c. BC: one of the Atrebates, with a capital in Calleva Atrebatum (Silchester); one of the Belgae with its capital at Venta Belgarum (Winchester); and one of the Reg(i)ni, with a capital at Noviomagus Reginorum (Chichester).