Bride of the Spear by Kathleen Herbert
Fifty years after the death of King Arthur, Britain is broken apart and the kings of the North are fighting for survival. Princess Taniu is offered as bride to the son of King Urien of Cumbria, but she wants to become a nun. She challenges the warriors' code and makes her life on her own terms. "Bride of the Spear" completes Kathleen Herbert's trilogy set in sixth-century Britain. These included the former winner of the Georgette Heyer prize for an outstanding historical novel, "Queen of the Lightning" and its sequel, "Ghost in the Sunlight".