┌─Baldwin I of Flanders
┌─Baldwin II of Flanders
│ │ ┌─Louis the Pious ⇒
│ │ ┌─Charles the Bald
│ │ │ └─Judith of Bavaria
│ └─Judith of Flanders
│ └─Ermentrude
Arnulf I of Flanders
│ ┌─Ecgberht of Wessex ⇒
│ ┌─Æthelwulf of Wessex
│ ┌─Alfred the Great of Wessex
│ │ └─Osburh
└─Ælfthryth of Wessex
│ ┌─Æthelred Mucel
└─Ealhswith
└─Eadburh