William I, Count of Nevers

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William I, Count of Nevers was born c. 1030, son of Renauld I, Count of Nevers and Adela of France. He married Ermengarde, daughter of Renauld, Count of Tonnerre in 1045. William died at Nevers, after 1083.

William I and Ermengarde had six children:

1. Ermengarde (b. 1050), married Hubert I, Count 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.