Isabel was born about 1266 in England. Isabel's father was Alexander Peck. She was an only child. Isabel is no longer alive.
General Notes
He [John Marmion] married Isabel (l). He died before 7 May 1322. [Complete Peerage VIII:518-20, (transcribed by Dave Utzinger)]
(l) This appears from his foundation of the Winteringham chantry, and it is possible that she was the daughter of Alexander Peck, but for this there is no sufficient evidence available.
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He [Ralph de Plaiz] married Isabel (----), and died s.p., shortly before 6 November 1243. Dower was assigned to his widow 1284. [Complete Peerage X:539, (transcribed by Dave Utzinger)]
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Note: CP did not know that Isabel was wife of both John Marmion & Ralph de Plaiz. This was discovered by Douglas Richardson and posted on the "Corrections" website.