Jeanne de Dammartin
| Joan | |
|---|---|
| Queen consort of Castile and León | |
| Tenure | 1237–1252 |
| Countess of Ponthieu | |
| Reign | 1251–1279 |
| Predecessor | Marie |
| Successor | Eleanor |
| Countess of Aumale | |
| Reign | 1239–1279 |
| Predecessor | Simon |
| Successor | John I |
| Born | 1220 |
| Died | 16 March 1279 (aged 58–59) Abbeville, France |
| Spouse |
Ferdinand III of Castile Jean de Nesle, Seigneur de Falvy et de La Hérelle |
| Issue among others |
Ferdinand II, Count of Aumale Eleanor, Queen of England Louis Simon John |
| House | Dammartin |
| Father | Simon, Count of Aumale |
| Mother | Marie, Countess of Ponthieu |
| Religion | Roman Catholicism |
Joan of Dammartin (French: Jeanne de Dammartin; c. 1220 – 16 March 1279) was Queen consort of Castile and León (1252), suo jure Countess of Ponthieu (1251–1279) and Aumale (1237–1279). Her daughter, the English queen Eleanor of Castile, was her successor in Ponthieu. Ferdinand II, Count of Aumale, her son and co-ruler in Aumnale, predeceased her, thus she was succeeded by her grandson John I, Count of Aumale.
Joan was the eldest daughter of Simon of Dammartin, Count of Ponthieu (1180- 21 September 1239), and his wife Marie of Ponthieu, Countess of Montreuil (17 April 1199- 1251). Her paternal grandparents were Alberic II, Count of Dammartin, and Mahaut de Clermont, daughter of Renaud de Clermont, Count of Clermont-en-Beauvaisis, and Clémence de Bar. Her maternal grandparents were William IV of Ponthieu and Alys, Countess of the Vexin, daughter of Louis VII of France and Constance of Castile.
After secret negotiations were undertaken in 1234, it was agreed that Joan would marry King Henry III of England. This marriage would have been politically unacceptable to the French, however, since Joan stood to inherit not only her mother's county of Ponthieu, but also the county of Aumale that was vested in her father's family. Ponthieu bordered on the duchy of Normandy, and Aumale lay within Normandy itself. The French king Philip Augustus had seized Normandy from King John of England as recently as 1205, and Philip's heirs could not risk the English monarchy recovering any land in that area, since it might allow the Plantagenets to re-establish control in Normandy.
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