William IV, Count of Nevers

William IV, Count of Nevers, (c. 1130 – Acre, 24 October 1168) Count of Nevers, Auxerre and Tonnerre (1161–1168).

William was a son of William III, Count of Nevers and Ida of Sponheim, and the older brother of his successor Guy, Count of Nevers. Their paternal grandparents were William II of Nevers and his wife Adelais. Their maternal grandparents were Engelbert, Duke of Carinthia and Uta of Passau.

A younger brother named Renaud of Nevers joined the Third Crusade and died in Acre on 5 August 1191. Their sister Adelaide of Nevers, married Renaud IV, Count of Joigny. Ermengarde of Nevers, another sister, is only mentioned in documents recording her donations to the Benedictine monastery of Molesme.

In 1164, William married Eléonore de Vermandois, later Eléonore, Countess of Vermandois in her own right from 1183 to 1214. His wife was a daughter of Raoul I, Count of Vermandois and his second wife Petronilla of Aquitaine, who was a daughter of William X of Aquitaine and Aenor of Châtellerault; therefore Eléonore was a niece of Eleanor of Aquitaine.

His wife was previously married to Godfrey of Hainaut, Count of Ostervant, son of Baldwin IV, Count of Hainaut and Alice of Namur, who died on 7 April 1163, while preparing for a journey to Palestine. Eléonore went on to marry Matthew of Alsace, Matthew, Count of Boulogne and (possibly) Etienne II of Blois. She never had children and her designated heir to her realms was Philip II of France, a paternal second cousin, once removed.

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