King Arthur - myth or reality? Who was he - a noble “knight king” or a brave and ruthless leader of the Celtic tribes? Did the Round Table, Camelot and the sword Excalibur, the Fairy Morgana and the magician Merlin exist in reality? And finally, what are they? scientific roots of the legend of the Holy Grail? The secrets and mysteries of Arthurian legends have haunted scientists, writers and artists for centuries. And some of these secrets and mysteries are revealed in their new international bestseller Simon Cox and Mark Oxbrow, based on real historical documents of the Dark Ages, classical and modern “Arthurian” theories and the results of numerous studies.