Ermengarde de Bar-sur-Seine & de Tonnerre, heiress, comtesse de Tonnerre

Hugues-Renaud was named Count of Tonnerre and Bar-sur-Seine after his mother Azeka died. When he chose to become a priest, he ceded his title to Tonnerre to his cousin Ermengarde de Tonnerre, wife of Guillaume I de Nevers, count of Nevers and Auxerre. He ceded his title of Count of Bar-sur-Seine to his sister Eustachie de Tonnerre and her husband Gautier I de Brienne, Count of Brienne.

See https://fr.wikipedia.org/wiki/Ermengarde_de_Tonnerre

She was living between 1036 and 1089 [Roderick W. Stuart, Royalty for Commoners: The Complete Lineage of John of Gaunt, Son of Edward III, Kings of England, and Queen Philippa (.: ., 3rd Ed., 1998), 254-32].