Her father was the son of Edmund Crouchback, 1st Earl of Lancaster and Blanche of Artois, Queen Dowager of Navarre, a granddaughter of Louis VIII of France and Blanche of Castile.
Her father's lineage traced back to Edmund Crouchback, 1st Earl of Lancaster and Blanche of Artois, Queen Dowager of Navarre, who was the granddaughter of Louis VIII of France and Blanche of Castile.