William I, Count of Nevers (c. 1029 – 20 June 1100), was the son of Renauld I, Count of Nevers and Hedwig of France, Countess d'Auxerre. He married Ermengarde, daughter of Renauld, Count of Tonnerre about 1039. William died in 1098. William I and Ermengarde: Renauld II (d. 1089), succeeded his father as Count of Nevers and Count of Auxerre. William II, succeeded his father as Count of Tonnerre Robert (d. 1095), later Bishop of Auxerre Ermengarde (d. 1090–95), married Hubert de Beaumont-au-Maine, Viscount of Maine Helvise, married William, Count of Évreux References Sources Nevers, William I, Count of Nevers, William I, Count of Counts of Nevers