Eustachie de Courtenay, dame de Pacy-sur-Armançon

http://fmg.ac/Projects/MedLands/chamsensjoi.htm#Eustachiediedafter1235

PIERRE [I] de France, son of LOUIS VI King of France & his wife Adélaïde de Maurienne ([1126]-Palestine 10 Mar [1180/10 Apr 1183]). ... m (before 24 Nov 1160) ELISABETH de Courtenay, daughter and heiress of RENAUD Seigneur de Courtenay & his first wife Helvis de Donjon ([1140/45]-14 Sep after 1205).

Pierre [I] & his wife had eleven children:

4. EUSTACHIE de Courtenay (-6 Apr after 1235). The chronology of her first marriage is too uncertain to speculate sensibly on the date of Eustachie’s birth. "Eustachia uxor defuncti Guillelmi de Brena" confirmed her husband’s deathbed donation to Quincy by charter dated 1199[263]. "Guillelmus de Chanlite" confirmed the donation of “pasturas suas de Lagnia” to Quincy abbey made by “Hugo de Lagnia...”, with the support of “uxore mea Eustachia”, by charter dated 1200[264]. Dame de Placy-sur-Armancon. “Eustachia comitissa Sacricesaris” recorded that “filius meus...bone memorie Andreas de Brena” had requested her and “fratri meo Willelmo de Tanlay” to carry out his last wishes, and founded an anniversary for him at Auxerre Saint-Etienne where he was buried, by charter dated May 1215[265]. “Eustachia comitissa Sacricesariensis” donated property to Senan priory, in accordance with the wishes of “Willelmus Sacricesariensis maritus meus” before leaving “ad subsidium Terre-Sancte cum domino Petro germano meo, tunc comite Autissiodorensi”, by charter dated 1218[266]. “Eustachia comitissa Sacricæsariensis” noted that “Willemus Sacricæsariensis maritus meus”, on leaving for “terræ sanctæ cum domino Petro germano meo tunc comite Autissiodorensi nunc autem Imperatore Constantinopolitano”, requested her to donate property to the priory of Sens Saint-Etienne by charter dated 1223[267]. The necrology of La Chartreuse de Bellary records the death "6 Apr" of "Eustache comtesse de Sancerre"[268]. m firstly GUILLAUME de Brienne, son of ERARD [III] Seigneur de Brienne & his wife Agnes de Montbéliard [Montfaucon] (-[1194/99], bur Auxerre St-Etienne). m secondly (1200) as his third wife, GUILLAUME de Champlitte, son of EUDES [I] "le Champenois" & his wife Sibylle --- (-[1209/10]). Vicomte de Dijon. Prince of Achaia 1205. m thirdly ([1211]%29 as his third wife, GUILLAUME Comte de Sancerre, son of ETIENNE [I] Comte de Sancerre [Champagne-Blois] & his wife Alix [Mathilde] de Donzy (-Epirus 1217).

http://fmg.ac/Projects/MedLands/chambrien.htm#ErardBriennedied1190B

Guillaume de Brienne & his wife EUSTACHIE de Courtenay had two children:

a) ANDRE de Brienne (-before May 1215, bur Auxerre Saint-Etienne). “Eustachia comitissa Sacricesaris” recorded that “filius meus...bone memorie Andreas de Brena” had requested her and “fratri meo Willelmo de Tanlay” to carry out his last wishes, and founded an anniversary for him at Auxerre Saint-Etienne where he was buried, by charter dated May 1215[104].

b) ELVIS de Brienne . The primary source which confirms her parentage and marriage has not yet been identified. m JEAN Vicomte de Saint-Florentin, son of - (-before Jul 1235).