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