William de Fiennes 1
- Born: Abt 1245, <Wendover, Buckinghamshire>, England
- Marriage (1): Blanche de Brienne Lady of Loupeland in 1269 in Wigmore, Herefordshire, England
- Died: 11 Jul 1302, Courtal, Flandre Occidental (Belgium) about age 57
Another name for William was Sir William de Fenlis.
William married Blanche de Brienne Lady of Loupeland, daughter of Jean de Brienne of Acre and Jeanne de Châteaudun, in 1269 in Wigmore, Herefordshire, England. (Blanche de Brienne Lady of Loupeland was born about 1245 in <Courtrain, Mynn>, France and died in 1302.)
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