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William III of Dampierre

William III of Dampierre (1224–1251), lord of Dampierre from 1231, was the eldest son of William II of Dampierre and Countess Margaret II of Flanders. When Margaret inherited Flanders and Hainault in 1244, a succession war pitted William against the Avesnes sons of her marriage. Louis IX of France awarded him Flanders in 1246, and Margaret invested him as count in 1247.

After peace with the Avesnes in May 1250, he was killed at a tournament in Trazegnies on 6 June 1251. His brother Guy succeeded him.

References

  1. en.wikipedia.org/wiki/William_II_of_Flanders
  2. fr.wikipedia.org/wiki/Guillaume_III_de_Dampierre