Goneril
Daughter of King Leir and sister of Regan and Cordelia.
Goneril and her sister, with the help of their husbands, seized Leir's kingdom, after he had given each of them one-quarter as their dowry. Cordelia got nothing, remained faithful to her father, went to France and married King Aganippus.
In time Cordelia and her husband raised an army and restored her father to the throne for the last three years of his life.
Maglaurus | The Legend of King Arthur