Jean I of Avesnes
Count of Hainault, Holland and Flanders (1244 - 1257)
Born (May 1, 1218) at Etraeungt, Nord - Died (Dec 24, 1257)
Buried at Valenciennes

Father - Bouchard of Avesnes
Mother - Margaret of Hainault

Jean I married (Oct 9, 1246) Adelaide of Holland
Children :

• Jean II of Avesnes
• Baldwin of Avesnes (1249)
• Burchard of Avesnes (2) (1251 - 1296) Bishop of Metz (1282 - 1296)
• Guy of Avesnes (1253 - 1317) Bishop of Utrecht (1301 - 1317)
• William of Avesnes (1254 - 1296) Bishop of Kamerijk (1286 - 1296)
• Johanna of Avesnes (c1256 - 1301) nun and Abbess of Flines (1276 - 1301)