Nielsen Hayden genealogy
Family: Roger de Seymour / Cecily de Beauchamp (F20107)
m. Aft Aug 1347-
Father | Male
Roger de Seymour
Born of Undy, Monmouthshire, Wales 
Died Between 1359 and 29 Jan 1366 Buried Married Aft Aug 1347 [1] Father Mother
Mother | Female
Cecily de Beauchamp
Born Between 1321 and 1331 Died 7 Jun 1394 Buried Father John de Beauchamp | F20108 Group Sheet Mother Margaret de St. John | F20108 Group Sheet
Child 1 | Male
+ William de Seymour
Born of Hatch Beauchamp, Taunton, Somerset, England 
Died 25 Aug 1391 Buried Spouse Margery de Brockbury | F20106 Married
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Sources - [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.