Pedigree

    /Guillaume de Roches
Jeanne de Roches
   |        /Robert III de Nevers-Sable
   |    /Robert IV de Nevers-Sable
    \Marguerite de Nevers-Sable
       |    /Geoffrey de Mayenne
        \Clemence de Mayenne
            \Isabel Yngling-Beaumont-Meulan

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