Marie, Countess of Ponthieu
Marie Talvas (17 Apr 1186 - 1251) was the Countess of Ponthieu, ruling from 1221 to 1251.
Biography
Marie was the daughter of William IV of Ponthieu and Alys, Countess of the Vexin. Since Marie was her father's only surviving child, she succeeded him as Countess of Ponthieu and ruled from 1221 to 1251.
Marriage and children
She married Simon de Dammartin about 1215. Their only surviving child was Jeanne of Dammartin, wife of Ferdinand III of Castile. Through her granddaughter Eleanor of Castile she is an ancestor of the current British royal family.