William II of Dampierre

William II of Dampierre (1196–1231), the second son of Guy II, constable of Champagne, and Mathilde of Bourbon, held the lordship of Dampierre from 1216. In 1223 he married Margaret, later Countess Margaret II of Flanders and Hainault.

Their Dampierre sons later pressed her claim against the children of her first marriage in the War of the Succession of Flanders and Hainault. With Margaret he founded Cistercian nunneries, including one at Saint-Dizier in 1226; he died in 1231 and was buried there.