Written from a post-colonial North American perspective, this study considers the ways in which medieval British writers, in the wake of the Norman Conquest, used Arthurian historiography to reflect their fears about colonial contamination' and about borders in general. The first half of the study examines the presentation of British history in works written on the Anglo-Welsh border. Warren then examines literature from the continent to look at British history from a Norman perspective. Parts of this study have been previously published.