This ground-breaking exploration of the Anglo-Saxon 'Avon valley frontier', combines archaeology and documentary sources, to present a case for remarkable continuity during the Dark Age and Anglo-Saxon period. Based on research in the department of Anglo-Saxon, Norse and Celtic History at Cambridge University, this study explores the evidence of archaeology, chronicles, charters and place-names to analyse the history of the 'Bristol Avon' as a frontier from the 4th to the 11th century. The result is a regional history that mirrors the history of Anglo-Saxon England. It also reveals a striking continuity in the use of the Avon valley as a frontier; the roots of which are discernible in the Late Iron Age. Yet this continuity tells two different 'stories', either side of Bath, which influenced the actions of successor kingdoms over hundreds of years. In this history, Offa, Alfred, Guthrum, Edward the Elder, Athelstan, Edgar and Cnut all played their parts. Even the legendary Arthur and the semi-legendary Vortigern have walk-on parts. What is surprising is that 21st century civil and Church boundaries still reflect this history, which is over 1,500 years old.