Princess Madelydd is the Princess of Celtica and the daughter of King Swyddned. She is mentioned in The Burning Bridge and is known to be good friends with Princess Cassandra from Araluen. Princess Cassandra (Evanlyn) was headed to visit her during The Burning Bridge. Unfortunately, Morgarath's Wargals had come upon the party. Cassandra was later found by Will, Horace, and Gilan when she adopted the identity of Evanlyn.