Cte Guillaume III "le Bon" DE HAINAUT
- Born: Abt 1286, Avesnes, Pas-De-Calais, France
- Married (1): 19 May 1305
- Died: 7 Jun 1337, Valenciennes, Hainault, Belgium
Guillaume was also known as Willem III, Count of Holland.
The Chronologia Johannes de Beke names (in order) "Iohannem primogenitum, Wilhelmum succedentem Hollandie comitem, Iohannem de Bellomonte, dominum Henricum Cameracensem canonicum, domicellum Walravenum, Iohannam abbatissam Fontanalecensem, Margareta comitissam Atrabatensem, Adelheydim comitissam Claromontensem, Mariam comitissam de Berbenoys, Machtildim dominam de Niele" as children of Count Jean & his wife.
He succeeded his father in 1304 as GUILLAUME III "le Bon" Comte de Hainaut, WILLEM III Count of Holland. 1
Guillaume married Jeanne CAPET, Comtesse de Valois, daughter of Charles CAPET, Comte de Valois et d' Alençon, and Ctsse Marguerite D' ANJOU et du Maine, on 19 May 1305. (Jeanne CAPET was born about 1294 in Longpont, Aisne, France and died on 7 Mar 1352 in Abbaye de Fontenelles, Hainaut, Belgium.)