Nielsen Hayden genealogy
Descendants of (Unknown second wife of Amadeus I of Geneva)
- Aft 1169
(Unknown second wife of Amadeus I of Geneva)
( - Aft 1169)
Amadeus I (1100 - 26 Jun 1178)(m. Between 1137 and 1147)
   └─ (Unknown daughter of Amadeus I of Geneva) ( - Aft 1234)
    Ebel de Grandison (Abt 1144 - Between 1235 and 1236)
       └─ Pierre de Grandison (Abt 1186 - 1258)
        Agnès de Neufchâtel (Between 1207 and 1209 - Aft 15 Apr 1283 bur.Priory Church of Saint-Jean Baptiste,
        Grandson, Jura-Nord Vaudois, Vaud, Switzerland)(m. Abt 1225)
        Grandson, Jura-Nord Vaudois, Vaud, Switzerland)(m. Abt 1225)
           └─ William de Grandison (Between 1250 and 1251 -
            27 Jun 1335 bur.Dore Abbey, Herefordshire, England) =>
            27 Jun 1335 bur.Dore Abbey, Herefordshire, England) =>
            + Sibyl de Tregoz (Abt 1272 - 21 Oct 1334 Dore, Herefordshire, England)(m. Bef 1286)