┌─William IV of Aquitaine
┌─William V of Acquitaine
┌─William VIII of Aquitaine
│ │ ┌─Otto-William of Burgundy
│ └─Agnes of Burgundy
│ └─Ermentrude de Roucy
William IX of Aquitaine
│ ┌─Hugh Capet King of the Franks ⇒
│ ┌─Robert II the Pious King of the Franks
│ │ └─Adelaide of Aquitaine
│ ┌─Robert I of Burgundy
│ │ └─Constance of Arles
└─Hildegarde of Burgundy
│ ┌─Geoffrey I of Anjou
│ ┌─Fulk III of Anjou
│ │ └─Adelaide de Vermandois ⇒
└─Ermengarde of Anjou
└─Hildegarde de Sundgau