The nations which occupied the parts of Britain between the Thames and the Channel at the time of Cæsar's invasion, were colonies from Belgic Gaul; and of these the Bibroci derived their name and that of their chief town Bibracte from Bibrax, which is mentioned by Cæsar as not far from Rheims; and of which the situation seems to have been fixed with accuracy by D'Anville at Bièvre 8 miles north-west of the river Aisne.