William Fitzwilliam De Windsor 
William Fitzwilliam De was born about 1100. William Fitzwilliam De's father was William Fitzwalter De Windsor and his mother is Agnes De Valoines. His paternal grandfather was Walter+ Fitzotho and his paternal grandmother is Gwladus Verch Rhiwallon Of+ Powys. He was an only child. He died about 1160.General Notes
SOURCES: LDS FHL Ancestal File # (familysearch.org)
"Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, F.L. Jacquier <Genealogy of Lewis Carroll, Justin Swanstrom, The Royal Families of England Scotland & Wales by Burkes Peerage; Debrett's Peerage & Baronage; Table of descendants French Canadian Genealogical Society; Families of Monfort-sur-Risle & Bertrand de Bricquebec; The Dukes of Normandy, XXXXI, Paul Leportier, Claude Barret>, H.R. Moser <Burke Peerage>, L. Orlandini, O.Guionneau, L.B. de Rouge, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842>, L. Gustavsson, C. Cheneaux, E. Lodge, S. Bontron <Brian Tompsett>, R. Dewkinandan, H. de la Villarmois, C. Donadello; Scevole de Livonniere, H. de la Villarmois, I. Flatmoen)... http://geneastar.org.
"Ancestors/Descendants of Pepin I Carolingien" http://www.geneastar.org,
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Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.~ 0934
- b.~ 0970 in Florence, Tuscany, Italy d.> 1006
- b.~ 1006 in Florence, Italy
- b.~ 1027 in Pembrokeshire, Wales d.> 1086
- b.1068 in Pembrokeshire, Wales d.~ 1130
- b.~ 0960 in Powys, Wales
- b.~ 1000 in Powys, Wales d.1073 in Killed in the battle of Mechain, Montgomeryshire, Wales
- b.~ 0938 in Dynevor Castle, Carmarthshire, Wales d.0999
- b.~ 0965 in Deheubarth, Wales
- b.~ 1030 in Powys Castle, Wales
- b.~ 1100 d.~ 1160
- b.1072
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He had a biological son named William De.