/Richard de Clare
        /Gilbert de Clare
       |    \Amicia FitzRobert
    /Richard de Clare
   |   |    /William Marshall
   |    \Isabel Marshall
   |        \Isabel de Clare
Isabel de Clare
   |        /Roger de Lacie
   |    /John de Lacie
   |   |    \Maud de Clare
    \Maud de Lacie
       |    /Robert de Quincy
        \Margaret de Quincy
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