| Husband: | Simon of DAMMARTIN (1180-1239) | |
| Wife: | Marie of PONTHIEU (1199-1251) | |
| Children: | Joan of DAMMARTIN (c. 1200-1279) | |
| Name: | Simon of DAMMARTIN | |
| Sex: | Male | |
| Father: | - | |
| Mother: | - | |
| Birth | 1180 | |
| Occupation | Count of Ponthieu | |
| Death | 21 Sep 1239 (age 58-59) | |
| Name: | Marie of PONTHIEU | |
| Sex: | Female | |
| Father: | - | |
| Mother: | - | |
| Birth | 17 Apr 1199 | |
| Occupation | Countess of Montreuil | |
| Death | 1251 (age 51-52) | |
Spouse: Saint FERDINAND III, Saint Ferdinand III
| Name: | Joan of DAMMARTIN | |
| Sex: | Female | |
| Spouse: | Saint FERDINAND III (1199-1252) | |
| Birth | c. 1200 | |
| Occupation | Countess of Ponthieu | |
| Death | 16 Mar 1279 (age 78-79) | Abbeville |