Ermengarde of Tonnerre

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Ermengarde (c. 1032 - 1083), daughter of Renauld, Count of Tonnerre, married William I, Count of Nevers, in 1045. She had six children:

1. Ermengarde (b. 1050), marrried Count Hubert I of Beaumont; 2. Robert (1052 - Feb 12, 1095), later Bishop of Auxerre; 3. William II (1052 - 1090), inherited grandfather's title as Count of Tonnerre; 4. Heloise (b. 1056), married William, Count of Evreux; 5. Sibille (1058 - 1078), married Hugh I, Duke of Burgundy; and 6. Renauld II (1059 - 1097), inherited father's title as Count of Nevers.

Her husband William I was the son of Renauld I, Count of Nevers and Adela of France.