William III of Dampierre

William III of Dampierre

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.

Margaret inherited Flanders and Hainault in 1244 and immediately the War of the Succession of Flanders and Hainault began between William and his brothers, the Dampierre claimants, and the children of Margaret's first marriage to Bouchard of Avesnes. Margaret favoured William and declared him her heir. In 1246, Louis IX of France intervened to arbitrate the conflict and declared Flanders to William and Hainault to John I of Avesnes. Margaret officially invested William as count in 1247 and he is known, as count, as "Willem (or Guillaume) II."

In November of that year, William married Beatrice, daughter of Henry II, Duke of Brabant and Marie of Hohenstaufen. They had no children. Meanwhile the fight continued over Namur between the Dampierres and the Avesnes. On 19 May 1250, peace was signed. On 6 June the next year, William was assassinated at a tournament in Trazegnies by a group of knights financed by Avesnes. The war began anew with Guy, William's younger brother, taking up Flanders and the Dampierre claim.


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