Pedigree

        /John Vipount
    /Robert de_Vipount
   |    \Sybil de_Ferrers
Isabel de_Vipount
   |        /Geoffrey Fitz_Piers
   |    /John (Fitz_Geoffrey) de_Baronis
   |   |    \Aveline de_Clare
    \Isabella Fitz_Geoffrey
       |    /Ralph Bigod
        \Isabel Bigod
            \Bertha Furnival

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