Queen Agatha Pendragon of Camelot is one of the main protagonists of The School for Good and Evil book series and in The Tale of Sophie and Agatha. She is a Reader chosen by the School Master to attend the School for Good. She is married to King Tedros of Camelot, making her the Queen of Camelot.
At the end of Quests for Glory, she and Tedros were replaced by Rhian and Sophie as the King and Queen of Camelot, but in the contest to determine the one true king, Tedros wins and reclaims the throne.