Vem gifte sig med William II, Count of Flanders?

William III (1224 – 6 June 1251) was the lord of Dampierre from 1231 and count of Flanders from 1247 until his death. He was the son of William II of Dampierre and Margaret II of Flanders.

Beatrice of Brabant (1225 – 11 November 1288), was a Landgravine consort of Thüringia and a Countess consort of Flanders, married first to Henry Raspe, Landgrave of Thuringia, and later to William II, Count of Flanders.