Joan de Fiennes 
Joan de was born about 1272 in Wendover Manor, Buckinghamshire, England. She died before October 26th, 1309.General Notes
Joan, said to be dau of William de Fiennes and Blanche de Brienne. [Ancestral Roots]
Note: I believe that this Joan, according to Burke's Peerage, is an alternative wife for John. He was probably not married to both Joans.
Joan de and John 1st Baron were married in a religious ceremony in Alternate Wife.
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