«King Javan's Year» by Katherine Kurtz

A young king’s ascension threatens a traitorous conspiracy of powerful nobles who plan to brutally eliminate all magic-users from their medieval realmThe brief reign of Alroy Haldane is nearly at an end, as the life of the young king of Gwynedd slowly slips away. Called back from the abbey where he has sought sanctuary for the last three years, Alroy’s twin, Prince Javan, prepares to ascend the throne—against the wishes of the former regents, who plan to enslave or destroy all Deryni in the kingdom. Though human, Javan secretly possesses the psychic powers of the magical race that the powerful faction of great lords and religious zealots strives to eliminate—and it is this ability that alerts him to the terrifying scope of their dark treachery. While his enemies do not yet realize how determined a foe the young liege is, Javan must summon remarkable courage and cunning if he hopes to prevail against them—or even survive.In the middle chapter of her enthralling medieval fantasy trilogy, the Heirs of Saint Camber, award-winning author Katherine Kurtz adds richness and depth to the alternate world she has so magnificently brought to life in three previous series. Blending exquisitely detailed history with breathtaking invention, Kurtz proves once again that she is without equal in the popular realm of fantasy fiction.