The Last Enchantment Hardcover – July 1, 1979 by Mary Stewart (Author), Morrow (Editor), Jacket by Allen Hood (Illustrator)
Book 3 of 5: Arthurian Saga
 
Arthur Pendragon is King! Unchallenged on the battlefield, he melds the country together in a time of promise. But sinister powers plot to destroy Camelot, and when the witch-queen Morgause -- Arthur's own half sister -- ensnares him in an incestuous liaison, a fatal web of love, betrayal, and bloody vengeance is woven.
 
7.2