Pedigree

            /Hugh de Lacy
        /Walter de Lacy
       |    \Rose de Monmouth
    /Gilbert de Lacy
   |   |    /William III de Briouze
   |    \Margaret de Briouze
   |        \Maud de St. Valery
Walter de Lacy
   |        /Roger le Bigod
   |    /Hugh le Bigod
   |   |    \ Ida
    \Isabel le Bigod
       |    /William Marshal
        \Maud Marshal
            \Isabel de Clare

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