Margaret Mortimer, Baroness Wigmore Wife of Edmund Mortimer of Wigmore, 2nd Baron Mortimer (1201–1333) Parents Blanche of Brienne Guillaume II de Fiennes Children Elizabeth Mortimer Hugh Mortimer Maud de Mortimer Roger Mortimer, 1st Earl of March Edmund Mortimer Joan Mortimer Siblings Jeanne de Fiennes John I of Fiennes Mahaut de Fiennes Partners Edmund Mortimer, 2nd Baron Mortimer