|Simon of Dammartin, Count of Ponthieu|
|Died||21 September 1239|
|Spouse(s)||Marie, Countess of Ponthieu|
|Father||Alberic II of Dammartin|
|Mother||Mathildis of Clermont|
Simon was the brother of Renaud I, Count of Dammartin, who had abducted the heiress of Boulogne, and forced her to marry him. It is thought that in order to strengthen the alliance with the Dammartins, King Philip Augustus of France allowed Simon to marry Marie, Countess of Ponthieu, who was a niece of the king, in 1208. Renaud and Simon of Dammartin would eventually ally themselves with John, King of England. In 1214 the brothers stood against Philip Augustus in the Battle of Bouvines. The French won the battle, and Renaud was imprisoned, while Simon was exiled.
Marie's father William IV, Count of Ponthieu had remained loyal to Philip Augustus. When William died in 1221, Philip Augustus denied Marie her inheritance and gave Ponthieu in custody to his cousin Robert III, Count of Dreux. After the death of Philip Augustus, Marie was able to negotiate an agreement with his successor Louis VIII in 1225. Ponthieu was held by the king, and Simon would only be allowed to enter this or any other fief if he obtained royal permission. In 1231 Simon agreed to the terms and added that he would not enter into marriage negotiations for his daughters without consent of the king.
Simon and his wife Marie had four daughters:
- Joan, Countess of Ponthieu (1220–1278), married 1) Ferdinand III of Castile. Mother of Eleanor of Castile, the wife of Edward I of England. Married 2) Jean de Nesle, Seigneur de Falvy et de La Hérelle.
- Mathilda of Dammartin (-1279), married John of Châtellerault
- Philippe of Dammartin (-1280), married 1) Raoul II of Lusignan, 2) Raoul II, Lord of Coucy, 3) Otto II, Count of Guelders.
- Maria of Dammartin, married John II, Count of Roucy.
- Baldwin, John W. (2000). Aristocratic Life in Medieval France: The Romances of Jean Renart and Gerbert de Montreuil, 1190-1230. Johns Hopkins University Press.
- Grant, Lindy (2005). Architecture and society in Normandy 1120-1270. Yale University Press.
- Krause, Kathy M. (2019). "From Mothers to Daughters:Literary Patronage as Political Work in Ponthieu". In Tanner, Heather J. (ed.). Medieval Elite Women and the Exercise of Power, 1100--1400: Moving Beyond the Exceptionalist Debate. Palgrave Macmillan.
- Johnstone, Hilda (1914). "The County of Ponthieu, 1279-1307". The English Historical Review. Oxford University Press. Vol. 29, No. 115 July.
- Pollock, M. A. (2015). Scotland, England and France After the Loss of Normandy, 1204-1296: "Auld Amitie". The Boydell Press.
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