William FitzOsbern was the son of Osbern the Steward, a nephew of Duchess Gunnor, the wife of Duke Richard I of Normandy. Osbern was the steward of his cousin Duke 展开

William FitzOsbern was probably raised at the court of his cousin William, Duke of Normandy, and like his father, became one of the ducal stewards. … 展开

FitzOsbern married twice:
• Firstly to Adeliza de Tosny, daughter of Roger I of Tosny, by whom he had four children:
• Secondly, it … 展开

• William Fitzosbern, Dictionary of Welsh Biography 展开

After William became King of England, FitzOsbern was made an earl, with major land holdings in Gloucestershire, Herefordshire, … 展开

• Pierre Bauduin (2004). "Autour de la dos d'Adelize de Tosny : mariage et contrôle du territoire en Normandie (xie-xiie siècles)". Les pouvoirs … 展开