Eustachie de Tonnerre, comtesse de Bar-sur-Seine 1
- Born: Bar-sur-Seine, Aube, Champagne, France
- Married:
- Died: Between 1072 and 1090
 Research Notes:
Ctss de Bar-sur-Seine. "Rainardus…Lingonensis episcopus, Walteri Breonensis comitis heredis mei et uxoris sue sororis mee" donated property to Montiérender by charter dated 1072, subscribed by "Eustatie comitisse, Walteri comitis Brinensis, Engelberti filii eius, Widonis comitis, Girardi militis, Widonis militis, Aldonis". 2
Marriage Information:
Eustachie married Gauthier I, comte de Brienne, son of Engelbert III, comte de Brienne and Péronelle de Joigny. (Gauthier I, comte de Brienne was born in Brienne-le-Château, Aube, Champagne, France and died before 1090.)
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