Who married William IV, Count of Nevers?

William IV, (French: Guillaume IV, c. 1130 – Acre, 24 October 1168) was count of Nevers, Auxerre, and Tonnerre from 1161 until his death.

Eleanor of Vermandois (French: Éléonore or Aliéonor or Aénor de Vermandois, 1148 or 1149 – 19 or 21 June 1213) was reigning countess of Vermandois and Valois from 1182 to 1213 and by marriage countess of Ostervant, Nevers, Auxerre, Boulogne and Beaumont.