Based on Jones & Mattingly's Atlas of Roman Britain (ISBN 978-1-84217-06700, 1990, reprinted 2007, pp. 317, 318), Haywood's Dark Age Naval Power (ISBN 1-898281-43-2, 1999, pp. 84–86, 121), Lebecq's The Northern Seas (fifth to eighth centuries) (in The New Cambridge Medieval History, Vol I c.500–c.700, ISBN 13-978-0-521-36291-7, 2005, p. 643), and Wood's The Channel from the 4th to the 7th centuries AD in Carver's Maritime Celts, Frisians and Saxons (ISBN 978-0906780930, pp 93–97). The suggestion that settlements on the south coast of Britain were made from the Bessin is from Haywood (Vron, for example, was abandoned c. 450).