Gwladus Ddu Welsh noble (1300–1251) Parents Joan, Lady of Wales Llywelyn ab Iorwerth Children Roger Mortimer, 1st Baron Mortimer Isolt de Mortimer Siblings Gruffudd ap Llywelyn Dafydd ap Llywelyn Elen ferch Llywelyn Gruffudd ap Llywelyn ab Iorwerth Angharad ferch Llywelyn Susanna ferch Llywelyn Tegwared y Bais Wen Margaret ferch Llywelyn Partners Reginald de Braose Ralph de Mortimer