Ermengarde of Tonnerre

Ermengarde ({{circa}} 1032 – 1083), daughter of Renauld, Count of Tonnerre and Herviz,{{sfn|Bouchard|1987|p=370}} married William I, Count of Nevers{{sfn|Bouchard|1987|p=370}} in 1045. She had six children:

1. Ermengarde (born 1050, date of death unknown), married Hubert I, Count of Beaumont{{sfn|Bouchard|1987|p=342}}
2. Robert (1052 – February 12, 1095), later Bishop of Auxerre{{sfn|Bouchard|1987|p=342}}
3. William II (1052–1090), inherited grandfather's title as Count of Tonnerre{{sfn|Bouchard|1987|p=342}}
4. Heloise (born 1056, date of death unknown), married William, Count of Évreux{{sfn|Bouchard|1987|p=342}}
5. Sibille (1058–1078), married Hugh I, Duke of Burgundy
6. Renauld II (1059–1089), inherited father's title as Count of Nevers.{{sfn|Bouchard|1987|p=342}}

Her husband William I was the son of Renauld I, Count of Nevers and Hedwig/Advisa of Auxerre,{{sfn|Bouchard|1987|p=342}} daughter of Robert II of France.{{sfn|Bouchard|1987|p=343}}