William II, Count of Flanders
William III 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. Wikipedia
Born: 1224
Great-grandparents: William I of Dampierre, Baldwin V, Count of Hainaut, Margaret I, Countess of Flanders, and more
Grandparents: Baldwin I, Latin Emperor, Mathilde of Bourbon, Guy II of Dampierre, and more
Assassinated: June 6, 1251, Courcelles, Belgium
Cousin: Maria de Portugal
Parents: Margaret II, Countess of Flanders and William II of Dampierre