Pedigree

            /Robert I de Beaumont
        /Robert de Beaumont
       |    \Isabel (or Elizabeth) de Vermandois
    /Robert III "Blackmaine" de Beaumont
   |   |    /Ralph de Gael de Montfort
   |    \Amice de Montfort
   |        \Emma of Hereford
Margaret de Beaumont
   |        /Ivo de Grentmesnil
   |    /Hugh II de Grentmesnil
   |   |    \Emma de Gant
    \Petronilla (or Pernell) de Grentmesnil
       |    /Robert de Stouteville
        \N. de Stuteville
            \Adeliza (or Alice) de Beaumont

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