Nielsen Hayden genealogy
Descendants of Jeane de Brienne, King of Jerusalem; Latin Emperor of Constantinople
Abt 1175 - 1237 (~ 62 years)Father: Erard II de Brienne ( - 1191)
Mother: Agnès
Jeane de Brienne, King of Jerusalem; Latin Emperor of Constantinople (Abt 1175 - 23 Mar 1237 Constantinople)
Bérenguère of Castile-León (Abt 1199 - 12 Apr 1237 Constantinople)(m. 1223 Burgos, Castile, Spain)
   ├─ Jean de Brienne ( - 8 Jan 1296 bur.Maubuisson Abbey near Pontoise, near Paris, France)
   │ Jeanne de Châteaudun ( - Abt 1254 bur.Maubuisson Abbey near Pontoise, near Paris, France)(m. 1251)
   │    └─ Blanche de Brienne
   │     Guillaume de Fiennes (of Wendover, Buckinghamshire, England - 11 Jul 1302 Kortrijk, Flanders)
   │     (m. Between 18 Jan 1266 and Feb 1267)
   │     (m. Between 18 Jan 1266 and Feb 1267)
   │        │ + Edmund de Mortimer (Between 1251 and 1254 of Wigmore, Herefordshire, England -
   │        │ 17 Jul 1304 Wigmore Castle, Herefordshire, England)(m. Bef 12 Dec 1285)
   │        │ 17 Jul 1304 Wigmore Castle, Herefordshire, England)(m. Bef 12 Dec 1285)
   │        │ + John Wake (Abt 1268 - Abt 10 Apr 1300)(m. Bef 24 Aug 1291)
   │         + Isabelle de Dampierre ( - 1323)(m. 1307)
   └─ Louis de Brienne
    Agnes de Beaumont
       └─ Henry de Beaumont ( - 10 Mar 1340)
        Alice Comyn ( - Bef 10 Aug 1349)(m. Bef 14 Jul 1310)
           │ + Henry of Grosmont (1314 - 24 Mar 1361 Leicester, Leicestershire, England)(m. Abt 1337)
           └─ John de Beaumont (Abt 1318 - 14 Apr 1342 Northampton, Northamptonshire, England) =>
            + Eleanor of Lancaster (Abt 1318 - 11 Jan 1372 Arundel, Sussex, England)(m. Bef Jun 1337)