Jean Ier d'Avesnes

• Born in Houffalize
• Deceased in Valenciennes

Parents

• Bouchard d'Avesnes (1182 - 1244), seigneur d'Avesnes
• Marguerite de Hainaut, alias Marguerite de Constantinople (1202 - 1280), comtesse de Flandre

Family

• Married on October 9, 1246, with Aleid van Holland (c. 1228 - 1284), issuing
  • Gui
  • Jean (1248 - 1304)