William I, Count of Hainaut
Count of Holland, Zeeland and Hainaut (1287–1337)
(1287–1337)
Parents
Philippa of Luxembourg
John I of Hainaut
Children
Jan Aelman
William II of Hainaut
Catherine d'Avesnes
Isabella d'Avesnes
Joanna of Hainaut
Margaret II, Countess of Hainaut
Philippa of Hainault
Siblings
John of Beaumont
Alice of Hainault
Mary of Avesnes
Jan van Oostervant
Isabelle of Avesnes
Simon Heer van Bruelis
Aleida de Hainaut
Marguerite d'Avesnes
Willem Cuser
Partners
Joan of Valois, Countess of Hainaut