Ermengarde of Tonnerre

Ermengarde (c. 1032 – 1083), daughter of Renauld, Count of Tonnerre and Herviz, married William I, Count of Nevers in 1045. She had six children:
 * 1) Ermengarde (born 1050, date of death unknown), married Hubert I, Count of Beaumont
 * 2) Robert (1052 – February 12, 1095), later Bishop of Auxerre
 * 3) William II (1052–1090), inherited grandfather's title as Count of Tonnerre
 * 4) Heloise (born 1056, date of death unknown), married William, Count of Évreux
 * 5) Sibille (1058–1078), married Hugh I, Duke of Burgundy
 * 6) Renauld II (1059–1089), inherited father's title as Count of Nevers.

Her husband William I was the son of Renauld I, Count of Nevers and Hedwig/Advisa of Auxerre, daughter of Robert II of France.