Pedigree

            /Robert de Ferrers
        /Robert de Ferrers
       |    \Hawise de Vitre
    /William de Ferrers
   |    \Margaret Perveril
Walcheline de Ferrers Derby
   |        /William Peverell
   |    /William the younger Peverell
   |   |    \Adeline wife of William Peverell
    \Margaret Peverell
       |    /Roger III "le Poitevin" Montgomery
        \Avice de Lancaster
            \Ademade de la Marche

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