Mary married Thomas of Brotherton, 1st. Earl of Norfolk about 1335. Thomas (son of King Edward I "Longshanks" Plantagenet, of England and Marguerite of France) was born on 1 Jun 1300 in Manor House, Brotherton, Yorkshire, England; died on 4 Aug 1338 in Bury Saint Edmunds, Suffolk, England; was buried in Bury St. Edmunds Abbey, Suffolk, England. [Group Sheet]