Ever since Geoffrey of Monmouth wrote his 'History of the Kings of Britain' in the twelfth century, there have been numerous attempts to prove that the Arthur of Celtic legend was in fact based on an actual historical figure. This trend continues to the present day, although as yet no definitive literary or archaeological proof has emerged for Arthur's existence. In this new and vigorous re-examination of the Arthurian legend, Thomas Green considers the earliest surviving literary and folkloric sources for Arthur and contests the belief that he was an actual person. Far from being an historical figure, Arthur emerges as a mythical and folkloric figure, who over the course of history has been transformed into an historical king by a series of authors with their own political agenda. The evidence reveals that from an early period Arthur was clearly defined as a supernatural defender of Britain, who guarded its borders from all threats. Moreover, he had an intimate connection with the Otherworld and a long history of folkloric tradition attached to his name. This thought-provoking and engaging study challenges the long-standing fascination with proving that King Arthur was real and is essential reading for anyone with an interest in Arthur.