H. Taviani-Carozzi “La Terreur du Monde, Robert Guiscard et la Conquete Normande de l'Italie” Paris, Fayard, 1996 says mother was Adelaide del Vasto.

Gramps ID S0439

References

    1. KIng of Naples & Sicily, Roger II the Great [I31100]
    2. Birth, KIng of Naples & Sicily, Roger II the Great [E42126]