Research Notes:
Keats-Rohan states, [1]
Urso De Abitot
Domesday tenant-in-chief, sheriff of Worcestershire from c. 1069 until his death in 1108 (Sanders, 75); he apparently inherited the lands and offices in England of his brother Robert the dispencer after 1086. A Norman from Abbetot, Seine-Maritime, arr. Le Havre, cant. Saint-Romain, he was a tenant in Normandy of the chamberlains of Tancarville. His son and heir Roger was banished by Henry I in 1114, leaving the daughters of Urse and their husbands Roger Marmion and Walter I Beauchamp as heirs to his lands. Charters for Saint-Georges-de-Boscherville suggest that he also had a son Robert (see Loyd, I).
[1] K. S. B. Keats-Rohan, Domesday People, A Prosopography of persons occurring in English documents, 1066-1166 (Boydell & Brewer Ltd, 1999), 439, [GoogleBooks].