Robert supported King Henry I in his acquisition of the English Crown against latter's brother Robert II, Duke of Normandy. He was accordingly granted (by King William II Rufus) lands in Buckinghamshire, Cornwall and Gloucestershire that had formerly been held by King William I's wife, Matilda. He was a benefactor to Tewkesbury Abbey. He was Feudal Lord of Creully. He gained the title of Lord of Tewkesbury. He gained the title of Earl of Gloucester. In 1088 he was one of the Norman barons who after the Conquest held lands in Normandy and England, where he supported King William II Rufus against the revolt of his half-uncle, Odo, Bishop of Bayeux and Earl of Kent. After 1088 he conquered Glamorgan, South Wales. He died in active service to the Crown.
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