Gauthier I, comte de Brienne 1
- Born: Brienne-le-Château, Aube, Champagne, France
- Married:
- Died: Abt 1090
 Research Notes:
A manuscript genealogy, dated to the early 12th century, records "Windesmode Ingelbertus et Witdo de Upione, ex Ingelberto Walterius comes de Brena". "Comes Breonensium Gualterus cum matre sua Petronilla" donated property to Montiérender by charter dated 28 Dec 1035.
Comte de Brienne. The Chronicle of Alberic de Trois-Fontaines names "Galterus" as successor of "comes de Brena…Engilbertum" but does not specify the relationship between the two. 2
Marriage Information:
Gauthier married Eustachie de Tonnerre, comtesse de Bar-sur-Seine, daughter of Milon V, comte de Tonnerre and Azeka de Woevre. (Eustachie de Tonnerre was born in Bar-sur-Seine, Aube, Champagne, France and died between 1072 and 1090.)
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