Nielsen Hayden genealogy
Descendants of William I "Whiskers" de Percy
- 1096
William I "Whiskers" de Percy
( - 1096 Jerusalem)
   ├─ Ernald I de Percy
   │
   │    └─ Hawise de Percy
   │     Ralph de Neville (of Scotton, Lincolnshire, England - Abt 1164)
   │        └─ Ralph de Neville (of Scotton, Lincolnshire, England - Aft 1201) =>
   │         + Drusiana d'Aubigny (Bef 1177 - ??)
   └─ Alan de Percy (of Topcliffe, Yorkshire, England - Bef Dec 1135 bur.Whitby, Yorkshire, England)
    Emma de Gant ( - Aft 1140)
       └─ William de Percy (of Topcliffe, Yorkshire, England -
        Between 1174 and 1175 bur.Fountain Abbey, Yorkshire, England)
        Between 1174 and 1175 bur.Fountain Abbey, Yorkshire, England)
        Adelis de Tunbridge ( - Aft 1138)(m. Bef 1136)
        :   └─ Agnes de Percy ( - Bef 13 Oct 1204 bur.Whitby, Yorkshire, England) =>
        :    + Joscelin of Louvain (of Petworth, Sussex, England - 1180)(m. Between 1154 and 1161)
        + Sybil de Valognes ( - Aft 1212 bur.Nun Appleton Priory, Yorkshire, England)(m. Between 1164 and 1166)