Marie, Countess of Ponthieu

Countess suo jure of Ponthieu and Montreuil (1199–1250)

Parents

• William IV, Count of Ponthieu
• Alys, Countess of the Vexin

Children

• Agathe de Dammartin
• Joan, Countess of Ponthieu
• Philippa of Dammartin
• Mathilde de Dammartin
• Marie de Dammartin

Siblings

• daughter d'Anjou

Partners

• Matthieu de Montmorency, Comte de Ponthieu, Sire de Attichy
• Simon, Count of Ponthieu