Tags: Noble.
Margaret Mortimer Baroness Mortimer (née de Fiennes; after 1269 – 7 February 1333) was an English noblewoman born to William II de Fiennes Baron Tingry and Blanche de Brienne. Her paternal grandparents were Enguerrand II de Fiennes and Isabelle de Conde. Her maternal grandparents were Jean de Brienne and Jeanne Dame de Chateaudun.Margaret had a sister Joan de Fiennes (c. 1273 – before 26 October 1309) whose daughter Margaret Wake was the mother of Joan of Kent.