Between 28 July and 29 October 1276, in Paris, Blanche became the second wife of Edmund Crouchback, brother of King Edward I of England. The marriage was orchestrated by the dowager queen of France Margaret of Provence, who wished to secure a wealthy bride for her nephew. There are also reports, however, that the two married out of mutual attraction. Edmund joined Blanche in administering Champagne and Brie. Edmund and Blanche had four children: Mary, who died young, Thomas, Henry and John.