*Jean I de Hainault d'Avesnes Count in Flanders
born 1 May 1218 Etraeungt, Nord, France or Houffalize, Luxembourg
died 24 December 1257 Valenciennes, Nord, France

father:
*Bouchard d'Avesnes
born about 1182 Oizy, Namur, Belgium
died 1244 (beheaded)

mother:
*Marguerite Comtesse de Flanders
born 2 June 1202 Constantinople, Byzantium
died 10 February 1280
married March 1216 Etraeungt, Nord, France

siblings:
Baudouin d'Avesnes born about 1218 Houffalize, Luxenbourg died before 1219

spouse:
*Aleida Countess of Holland
born 1226 's-Hertogenbosch, Noord-Brabant, Netherlands
died 9 April 1283 Valenciennes, Nord, France
married September 1246 Frankfort-am-Main, Hessen-Nassau

children:
*Jean II de Holland d'Avesnes born 1247 Brabrant, Netherlands died 22 August 1304 Valenciennes, Nord, France
Marguerite d'Avesnes born about 1246 Valenciennes, Nord, France
Baudouin d'Avesnes born about 1249 Valenciennes, Nord, France
Bouchard (Bishop) d'Avesnes born 26 May 1251 Valenciennes, Nord, France died 29 November 1296
Guillaume (Bishop) d'Avesnes born about 1254 Valenciennes, Nord, France died 1296
Floris d'Avesnes born about 1255 Valenciennes, Nord, France died 23 January 1297
Jeanne d'Avesnes born about 1256 Valenciennes, Nord, France died 1304

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com