Simon, Count of Ponthieu French noble (1180–1239) Parents Mahaut de Clermont Alberic III of Dammartin Children Joan, Countess of Ponthieu Mathilde de Dammartin Marie de Dammartin Philippa of Dammartin Agathe de Dammartin Siblings Renaud I, Count of Dammartin Aelis de Dammartin Agnès de Dammartin Julia de Dammartin Partners Marie, Countess of Ponthieu