William IV, Count of Ponthieu

Count of Ponthieu (1179–1221)

Parents

• Beatrix of Saint-Pol
• John I, Count of Ponthieu

Children

• Marie, Countess of Ponthieu

Siblings

• Adèle de Ponthieu
• Marguerite de Ponthieu

Partners

• Alys, Countess of the Vexin