Juan I de Inglaterra
Her paternal grandparents were Ralph Stafford, 1st Earl of Stafford and Margaret de Audley. Her maternal grandparents were Thomas de Beauchamp, 11th Earl of Warwick and Katherine Mortimer, a daughter of Roger Mortimer, 1st Earl of March. Through his paternal and maternal grandmothers, she was descended from Edward I and John, King of England respectively.