┌─Nicolas of Avesnes
┌─Jacques of Avesnes
│ │ ┌─Henry I of Namur ⇒
│ └─Mathilde de la Roche
│ └─Mathilde von Limburg
┌─Bouchard IV of Avesnes
│ └─Ameline of Guise
John I of Avesnes
│ ┌─Baldwin IX Count of Flanders and Hainaut
└─Margaret II Countess of Flanders
└─Marie of Champagne