John I of Hainaut Count of Hainaut and Count of Holland and Zeeland (1247-1304) (1247–1304) Parents Adelaide of Holland John I, Count of Hainaut Children Willem Cuser Marguerite d'Avesnes Isabelle of Avesnes Simon Heer van Bruelis William I, Count of Hainaut Jan van Oostervant Alice of Hainault Aleida de Hainaut John of Beaumont Mary of Avesnes Siblings Willem van Avesnes Florent of Hainaut Guy of Avesnes Bouchard d'Avesnes Partners Ymsoete (?) Philippa of Luxembourg
