┌─Roger of Montgomery
┌─Robert of Bellême
│ │ ┌─William I Talvas ⇒
│ └─Mabel of Bellême
│ └─Hildeburg
┌─William of Ponthieu
│ │ ┌─Guy I of Ponthieu
│ └─Agnes de Ponthieu
│ └─Adela
Guy II of Ponthieu
│ ┌─Robert I of Burgundy ⇒
│ ┌─Henry of Burgundy
│ │ └─Helie of Semur
│ ┌─Odo I of Burgundy
└─Ela of Burgundy
│ ┌─William I of Burgundy
└─Sybilla of Burgundy
└─Stephanie