For the price of a truce, Yseult is sent to a world where magic is dying - to marry the father of the man she loves. The tragic love story of Yseult and Drystan plays out against the backdrop of a violent world threatening to descend into the Dark Ages . . . which only Arthur can prevent.
George R. R, Martin, Game of Thrones
Marion Zimmer Bradley, Mists of Avalon