Pedigree

            /Richard de CLARE
        /Gilbert de CLARE
       |    \Amice FITZROBERT
    /Richard de CLARE
   |   |    /Lord William MARSHAL
   |    \Isabella MARSHAL
   |        \Isabel de CLARE
Gilbert de CLARE
   |    /John de LACY
    \Matilda Maud de LACY
        \Margaret de QUINCY

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