Adelaide of Holland Countess of Hainaut (c.1230–1284) (1230–1284) Parents Matilda of Brabant Floris IV, Count of Holland Children John I of Hainaut Guy of Avesnes Bouchard d'Avesnes Willem van Avesnes Florent of Hainaut Siblings Floris de Voogd William II of Holland Margaret of Holland, Countess of Henneberg Partners John I, Count of Hainaut
