An up-to-date and comprehensive guide to the history of the 'Arthurian' phenomenon - the imaginary and historical world of the great British warlord and one of the huge historical mysteries of early and medieval Britain. The Arthurian story, based on fact and fiction, is central to Britain's 'creation myth' and the concept of Britain's heroic past. This is a deeply researched and scholarly but essentially accessible history and analysis for general readers and specialists and based on an impressive array of sources including Romano-British, Anglo-Saxon, rare medieval English, French and German sources, and archaeology - essential for modern historical research in early history. Modern and contemporary historiography is covered including 'debunking' treatments. The study surveys King Arthur in fact and fiction, his family, knights, and the legends that have grown up around them and developed to the enduring interest from history, literature to TV and film.