Eustachia Bar-sure-Seine
- Marriage: Gauthier I Comte de Brienne
- Died: Circ 1100
 Noted events in her life were:
• Web Reference: Charles Cawley's Medieval Lands, Burgundy Duchy Nobility.
"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" [Lalore, C. (ed.) (1878) Chartes de Montiérender, Collection des principaux cartularies du diocèse de Troyes Tome IV (Paris, Troyes) 48, p. 173]. Eustachie de Tonnerre married Gauthier comté de Brienne, son of Engelbert [III] comté de Brienne & his wife Petronille.
Eustachia married Gauthier I Comte de Brienne, son of Engelbert III de Brienne and Petronille. (Gauthier I Comte de Brienne died about 1090 in Brienne.)
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