Nielsen Hayden genealogy
Descendants of Robert de Grandmesnil
- Abt 1136Father: Hugh de Grandmesnil ( - 22 Feb 1098 Leicester Abbey, Leicester, Leicestershire, England)
Mother: Adeliza de Beaumont (of Beaumont-sur-Oise, Seine-et-Oise, France - 11 Jul 1091 bur.Abbey of Saint-Evroul, Saint-Evroult-Notre-Dame-du-Bois, Normandy, France)
Robert de Grandmesnil ( - Abt 1136)
   └─ William de Grandmesnil
   
       └─ Pernel de Grandmesnil ( - 1 Apr 1212)
        Robert de Breteuil (of Leicester, Leicestershire, England - 1190 bur.Durazzo, Greece)(m. 1155)
           │ + Saher de Quincy (1155 Winchester, Hampshire, England - 3 Nov 1219 Damietta, Egypt)(m. Bef 1173)
            + Simon IV de Montfort (Abt 1153 - Bef 18 Jul 1188)(m. Bef Jan 1175)