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http://en.wikipedia.org/wiki/Marie_of_PonthieuMarie of Ponthieu was the Countess of
Ponthieu and Countess of Montreuil, ruling from 1221 to 1251.
Biography
Marie was the daughter of
William IV of Ponthieu and
Alys, Countess of the Vexin, and granddaughter of King
Louis VII of France by his second wife Constance of Castile. As her father's only surviving child, Marie succeeded him, ruling as Countess of
Ponthieu and Montreuil from 1221 to 1251.
Marriages and children
She married
Simon de Dammartin before September 1208. He was the son of Alberic II de Dammartin and Maud de Clermont, daughter of Renaud de Clermont, Count de Clermont-en-Beauvaisis and Clemence de Bar.
[2] Simon and Marie had four daughters but only two are recorded. The eldest was
Jeanne of Dammartin , second wife of
Ferdinand III of Castile. Through her granddaughter
Eleanor of Castile she is an ancestor of the
British royal family. The other daughter was Philippa of Dammartin who married firstly Raoul II d' Issoudun, secondly Raoul II de Coucy, and thirdly Otto II, Count Geldern.
Marie married secondly sometime between September 1240 and 15 December 1241, Mathieu de Montmorency, Seigneur d'Attichy, who was killed in battle at Mansurrah on 8 February 1250 during the
Seventh Crusade, led by King
Louis VII of France.
[3]