┌─Baldwin IV of Flanders ⇒
┌─Baldwin V of Flanders
│ └─Otgive of Luxembourg ⇒
┌─Baldwin VI of Flanders
│ │ ┌─Robert II the Pious King of the Franks ⇒
│ └─Adela of France
│ └─Constance of Arles
┌─Baldwin II of Hainault
│ └─Richilde
Baldwin III of Hainault
└─Ida of Louvain