Note: N1183 Under Robert the Magnificent (1027–1035), he had the role of Steward or Seneschal. He kept this role after the Duke's death in 1035. He became one of the legal protectors of the young successor to the duchy, William the Bastard, known later as William the Conqueror, then aged 8.
The young Duke William was in danger, as other members of the ducal family were trying to assassinate him to regain power in the duchy, and the Norman barons were rebelling. Osbern was murdered at Le Vaudreuil in the winter of 1040-1041, while protecting the young Duke in the child's bedroom. According to Guillaume de Jumièges, his throat was cut by William, son of Roger I of Montgomery. Barnon de Glos-la-Ferrières avenged the death of his lord by killing the murderer.
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