Margaret de la Herne 
‌Margaret de and John were married in a religious ceremony in 1st wife.1 They had a son named John "Cam\Crouchback".
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Children
John "Cam\Crouchback" FitzGerald
John "Cam\Crouchback" was born about 1391 in Castletown, Kildrought, Kildare, Ireland. He died on July 10th, 1435 in Kildare, Ireland (dvp).1
1 Burke's Peerage & Baronetage, 106th Edition, Charles Mosley Editor-in-Chief, 1999 @ 1679
Further source/citation:
Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VII:228
Further source/citation:
Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Lt @ VII:228
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