John I, Count of Hainaut
Member of the Avesnes family
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John of Avesnes was the count of Hainaut from 1246 to his death. Wikipedia
Born: May 1, 1218, Houffalize, Belgium
Died: December 24, 1257 (age 39 years), Valenciennes, France
Grandchildren: William I, Count of Hainaut, John of Beaumont, Mary of Avesnes, and more
Parents: Margaret II, Countess of Flanders and Bouchard IV of Avesnes
Grandparents: Baldwin I, Latin Emperor, Marie of Champagne, and James of Avesnes
Children: John II, Count of Holland, Guy of Avesnes, Florent of Hainaut, and more
Spouse: Adelaide of Holland (m. 1246)