John and Caitlín Matthews have been studying the Arthurian legends and their background for more than 40 years. Recognized authorities on myths and legends of the Celtic tradition, they are the authors of more than 100 books, both separately and together, including Taliesin: The Last Celtic Shaman, Walkers Between the Worlds, King Arthur and the Goddess of the Land, and the award-winning Arthur of Albion, as well as several tarot decks and oracles. The Matthews live in Oxford, England.