Nielsen Hayden genealogy
Family: Guy-Geoffrey of Poitou / Hildegarde of Burgundy (F3924)
m. 1069-
Male
Guy-Geoffrey of Poitou
Birth Abt 1024 Death 25 Sep 1086 Chizé, Deux-Sèvres, Poitou-Charentes, France 
Burial Marriage 1069 [1] Father William III of Poitou | F4763 Group Sheet Mother Agnes of Burgundy | F4763 Group Sheet
Female
Hildegarde of Burgundy
Birth Abt 1050 Death Aft 1104 Burial Father Robert I | F4435 Group Sheet Mother Ermengarde of Anjou | F4435 Group Sheet
Male
+ William IX of Aquitaine
Birth 22 Oct 1071 Death 10 Feb 1126 Burial Spouse Dangereuse | F5141 Marriage Spouse Philippa of Toulouse | F4013 Marriage 1094
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Sources - [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.
- [S145] Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis and Walter Lee Sheppard, Jr. 8th edition, William R. Beall & Kaleen E. Beall, eds. Baltimore: Genealogical Publishing Company, 2004, 2006, 2008.