Nielsen Hayden genealogy
Descendants of John Deincourt
- Bef 1257Father: Oliver II Deincourt
Mother: Nichole
John Deincourt (of Blankney, Sleaford, Lincolnshire, England - Bef 14 Oct 1257)
Agnes de Neville (of Raby, Durham, England - Bef 20 Jul 1293)(m. Aft 1244)
   └─ Edmund Deincourt (of Blankney, Sleaford, Lincolnshire, England - 6 Jan 1327)
   
       ├─ John Deincourt (of Blankney, Sleaford, Lincolnshire, England - Bef 6 Jan 1326)
       │
       │    └─ William Deincourt (Bef 1300 of Blankney, Sleaford, Lincolnshire, England - 2 Jun 1364) =>
       │     + Millicent la Zouche ( - 22 Jun 1379)(m. Bef 26 Mar 1326)
       ├─ Isabel Deincourt ( - Aft 26 Jul 1348 bur.Sprotborough, Yorkshire, England)
       │ William fitz William (of Sprotborough, Yorkshire, England -
       │ Between 4 Mar 1339 and 1342 bur.Sprotborough, Yorkshire, England)
       │ Between 4 Mar 1339 and 1342 bur.Sprotborough, Yorkshire, England)
       │    ├─ John Fitzwilliam (of Sprotborough, Yorkshire, England - 10 Aug 1349) =>
       │    │ + Joan Reresby
       │     + Adam de Newmarch (of Womersley, Yorkshire, England - Between 1344 and 1352)
       └─ Margaret Deincourt ( - Bef 18 Oct 1333)
        Robert de Willoughby (Between 1250 and 1260 - Bef 25 Mar 1317)(m. Bef 1304)
           └─ John de Willoughby (6 Jan 1304 - 13 Jun 1349 bur.Spilsby, Lincolnshire, England) =>
            + Joan Roscelyn ( - Aft 15 Oct 1354)(m. Bef 2 Jul 1323)