Pedigree

            /Piers De Lutegareshale
        /Geoffrey Fitz Piers
       |    \Maud De Mandeville
    /John FitzGeoffrey
   |   |    /Roger de Clare
   |    \Aveline De Clare
   |        \Maude de St. Hillary
John fitz John
   |        /Roger Bigod
   |    /Hugh Bigod
   |   |    \Ida Isabel Plantagenet
    \Isabella Bigod
       |    /William Marshall
        \Maud Marshall
            \Isabel De Clare

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