William III Count of Flanders and Lord of Kortrijk [64363] ¹²⁷

  General Notes:

https://en.wikipedia.org/wiki/Margaret_II_of_Flanders

  Noted events in his life were:

• Acceded: Lord of Dampierre, 1231. was the lord of Dampierre from 1231 until his death.

• Acceded: Count of Flanders, 1247. Count of Flanders from 1247 until his death.

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."

William married Beatrice of Brabant Landgravine Consort of Thüringia and a Countess C [64364] [MRIN: 551618975], daughter of Henry II of Brabant Duke of Brabant [8559] and Maria of Germany Hohenstaufens [8552]. (Beatrice of Brabant Landgravine Consort of Thüringia and a Countess C [64364] was born in 1225 and died on 11 Nov 1288.)