John I, Count of Hainaut Count of Hainaut from 1246 to 1257 (1218–1257) Parents Margaret II, Countess of Flanders Bouchard IV of Avesnes Children Bouchard d'Avesnes Florent of Hainaut Willem van Avesnes John I of Hainaut Guy of Avesnes Siblings William II, Count of Flanders Guy John I of Dampierre Jeanne of Dampierre Baldwin of Avesnes Partners Adelaide of Holland
