The Realm of Albion — Marcus Pitcaithly

This is the story of the forgotten wife of the legendary King Llyr. Uprooted from her home at fourteen, and sent to a distant land to marry the aged king, Penarddun is plunged into a world of dynastic intrigue and tribal war. She soon learns that violence and treachery infect the very heart of her husband's court, and that the only way to survive is to be as strong and cunning as her enemies. The indulged princess must become a warrior queen.