Nielsen Hayden genealogy
Descendants of Margaret de St. John
- 1361Father: John de St. John (Between 1272 and 1274 of Basing, Hampshire, England - Bef 4 Apr 1329)
Mother: Isabel de Courtenay ( - Aft 12 Feb 1333)
Margaret de St. John ( - 19 Nov 1361)
John de Beauchamp (Abt 1306 of Hatch Beauchamp, Taunton, Somerset, England - 19 May 1343)
   └─ Cecily de Beauchamp (Between 1321 and 1331 - 7 Jun 1394)
    Roger de Seymour (of Undy, Monmouthshire, Wales - Between 1359 and 29 Jan 1366)(m. Aft Aug 1347)
       └─ William de Seymour (of Hatch Beauchamp, Taunton, Somerset, England - 25 Aug 1391)
        Margery de Brockbury
           └─ Roger Seymour (3 Jul 1370 of Hatch Beauchamp, Taunton, Somerset, England - 1420) =>
            + Maud Esturmy ( - Bef 1427)