Pedigree

            /Walter de St. Martin
        /William de Warenne
    /Rudolf de Warenne
   |    \Beatrice de Tarta
William de Warenne
   |    /Tesselin de Rouen
    \Beatrice de Vascoeuil
       |    /Osbern de Bolbec
        \Beatrice de Bolbec
            \Avalina d'Arques

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