Nielsen Hayden genealogy
Descendants of Essulf
- Bef 1159
Essulf
(of Birkin, Yorkshire, England - Bef 1159)
   ├─ Jordan fitz Essulf (of Thornhill, Dewsbury, Yorkshire, England - Aft 25 Jan 1194)
   │
   │    └─ Richard de Thornhill ( - Bef 1209)
   │     Alice ( - Aft 1209)
   │        └─ John de Thornhill (Bef 1203 of Thornhill, Dewsbury, Yorkshire, England - Bef 1250) =>
   │         + Olivia de la Mare
   └─ Peter fitz Assulf (of Birkin, Yorkshire, England - Bef 1143)
    Emma de Lascelles
       └─ Adam de Birkin (of Laxton, Nottinghamshire, England - 1185)
        Maud de Cauz ( - Bef 25 May 1224)
            + Robert le Vavasour (of Addingham, Yorkshire, England - Bef 1228)