┌─Henry I of Brabant
┌─Henry II of Brabant
│ │ ┌─Mathew of Boulogne
│ └─Matilda of Boulogne
│ │ ┌─Stephen of Blois King of England ⇒
│ └─Marie I of Boulogne
│ └─Matilda of Boulogne ⇒
Henry III of Brabant
└─Marie of Hohenstaufen