Robert I De Tesson 
Robert I De was born about 1040. Robert I De's father is Erneis De Tesson and his mother is Hasinsa De Novavilla De Courcy. His maternal grandparents are Baudric De+ Courcy and Alix Aubree De+ Brienne. He was an only child. He died in 1066 in Battle of Hastings.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.
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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.~ 1010
- b.~ 1040 d.1066 in Battle of Hastings
- b.17 SEP 879 in France d.7 OCT 929 in Peronne, Austrasia
- b.~ 0918 in Courcy, Ardennes, France
- b.~ 0900 in Wessex, England d.> 0951
- b.~ 0942 in Germany
- b.~ 0969 in Courcy/Courcy, Ardennes, Champagne, France
- b.~ 1015
- b.0893 in Normandy, France d.17 DEC 942 in Murdered
- b.28 AUG 933 in Fecamp, France d.20 NOV 996 in Fecamp, France
- b.< 0903 in Brittany, France
- b.0953 in Brienne, Normandy d.~ 1015
- b.~ 0933
- b.~ 0980
- b.~ 0905 in Guisnes, Picardy d.0965
- b.~ 0965 in Castle Guines, Artois/Pas-de-Calais, France
- b.~ 0891 in Flanders, Belgium d.27 MAR 964 in Flanders, Belgium
- b.~ 0932 in Flanders
- b.0915 in Vermandois, Neustria d.10 OCT 960 in Bruges, Aquitaine
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They had a son named Robert II De.