Roger Mortimer, 1st Baron Mortimer English Baron (1231–1282) (1231–1282) Parents Gwladus Ddu Ralph de Mortimer Children Ralph Mortimer Margaret de Mortimer Roger Mortimer de Chirk Isabella Mortimer, Countess of Arundel Edmund Mortimer, 2nd Baron Mortimer Sir William Mortimer Sir Geoffrey Mortimer Siblings Isolt de Mortimer Partners Maud de Braose, Baroness Wigmore