John D'AVESNES , Comte d'Hainaut
- Born: 1 May 1218, Houffalize, Luxemburg
- Marriage (1): Adelaïde OF HOLLAND on 9 Oct 1246
- Died: 24 Dec 1257, Valenciennes, Nord, France aged 39
General Notes:
https://en.wikipedia.org/wiki/John_I,_Count_of_Hainaut
Born in Houffalize, he was the eldest son of Margaret II of Flanders by her first husband, Bouchard IV of Avesnes. As the marriage of Margaret and Bouchard was papally dissolved, he was considered illegitimate.
His mother was remarried to William II of Dampierre and bore more children who could claim her inheritance. Thus, John and his brother Baldwin undertook to receive imperial recognition of their legitimacy and did so from the Emperor Frederick II in March 1243. On 5 December 1244, Margaret inherited Flanders and Hainaut and designated her eldest son by her second husband, William III of Dampierre, as her heir. Immediately a war, called the War of the Succession of Flanders and Hainault, was set off over the rights of inheritance, pitting John against William.
John married Adelaïde OF HOLLAND, daughter of Floris IV OF HOLLAND , Count of Holland and Matilda DE BRABANT , Countess of Holland, on 9 Oct 1246. (Adelaïde OF HOLLAND was born about 1230 and died in Apr 1284 in Valenciennes, Nord, France.)
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