Based on the Mabinogion, a collection of medieval Welsh tales, as well as later legends, tells of family members and servants important in the life of King Arthur, featuring Nimue, Morgan le Fay, Luned, and Mordred.
Galwyn, son of a Roman Celt, escapes from his tyrannical uncle and joins Lord Artos, later known as King Arthur, using his talent with languages and way with horses to help secure and care for the Libyan horses that Artos hopes to use in battle against the Saxons.
After he is orphaned and has his tongue cut out in a clash with the bullying sons of a Welsh noble, Evyn is sold as a slave and serves many masters, from the gracious Lady Swan Neck to the valiant Harold Godwinson, England's last Saxon king.
Relates the adventures of Sir Gawain, the only undefeated knight in King Arthur's court, who eventually learns the value of friendship, courtliness, and courtesy after a challenge from the Green Knight.