Nielsen Hayden genealogy
Descendants of (Unknown daughter of Gelduin of Dol)
Father: Gelduin (of Dol-de-Bretagne, Brittany, France - ??)
(Unknown daughter of Gelduin of Dol) (of Dol-de-Bretagne, Brittany, France - ??)
   └─ Maud d'Avranches ( - 21 Sep 1173)
    William de Curcy (Abt 1130 - 1162)(m. Abt 1155)
       └─ Hawise de Courcy (Abt 1157 of Okehampton, Devon, England -
        31 Jul 1219 bur.Ford Abbey, Dorset, England)
        31 Jul 1219 bur.Ford Abbey, Dorset, England)
        Reynold de Courtenay (Abt 1150 of Okehampton, Devon, England -
        27 Sep 1194 bur.Ford Abbey, Dorset, England)(m. Between 1173 and 1178)
        27 Sep 1194 bur.Ford Abbey, Dorset, England)(m. Between 1173 and 1178)
           └─ Robert de Courtenay (Abt 1183 of Okehampton, Devon, England -
            26 Jul 1242 Iwerne, Dorset, England) =>
            26 Jul 1242 Iwerne, Dorset, England) =>
            + Mary de Revières ( - Aft 12 Nov 1242)(m. Between 1210 and 1211)