Gauthier I Comte de Brienne
- Marriage: Eustachia Bar-sure-Seine
- Died: Abt 1090, Brienne
 Noted events in his life were:
• Web Reference: Charles Cawley's Medieval Lands, Comtés de Brienne.
"Comes Breonensium Gualterus cum matre sua Petronilla" donated property to Montiérender by charter dated 28 Dec 1035 [436]. Gauthier married Eustachie de Tonnerre, daughter of Milo (V) Comte de Tonnerre et de Bar-sur-Seine & his wife Aceka ---
Gauthier married Eustachia Bar-sure-Seine, daughter of Milo comté de Tonnerre et Bar-sur-Seine and Azeca. (Eustachia Bar-sure-Seine died Circ 1100.)
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