┌─Alan IV Fergant Duke of Brittany
┌─Conan III of Cornouaille
│ └─Ermengarde of Anjou
Bertha of Cornouaille
│ ┌─Robert I the Magnificent of Normandy ⇒
│ ┌─William I King of England
│ │ └─Herleve of Falaise
│ ┌─Henry I Beauclerc King of England
│ │ │ ┌─Baldwin V of Flanders ⇒
│ │ └─Matilda of Flanders
│ │ └─Adela of France ⇒
└─Maud FitzRoy
└─?