Background
In 1040 he succeeded his father as Count of Nevers and d"Auxerre and in 1065 he was also the Count of Tonnerre.
In 1040 he succeeded his father as Count of Nevers and d"Auxerre and in 1065 he was also the Count of Tonnerre.
William died at Nevers 20 June 1100. William I and Ermengarde had six children:
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
Sibille (1058–1078), married Hugh I, Duke of Burgundy
Ermengarde (d 1090-1095), married Hubert de Beaumont-au-Maine, Viscount of Maine
Helvise, married William, Count of Évreux.
