Brittany owes its name to the migration of Britons during the final years of Rome's occupation of Britain. The date, nature and extent of this migration is today obscured by myth and few documents survive. This scholarly synthesis draws on recent archaeological evidence to examine the reasons for the migration (was it to avoid Saxon and Frisian raids?), the impact of the Britons on the culture and government of Roman Armorica and the integration of Brittany into the Carolingian empire. The authors also consider the subsequent influx of Christian migrants from Saxon Britain and the characteristics of Breton archaeology. The emphasis throughout is on archaeology and the book is well-illustrated with photographs of sites, buildings and burials.