Robert Fitz Roger, 2nd Baron of Warkworth (father of John Fitz Robert). [Ancestral Roots]
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Robert Fitz-Roger, who m. Margaret, only child and heiress of William de Cheney, by whom he acquired the Barony of Horsford, co. Norfolk, and had an only son, John. This Robert obtained a confirmation, upon the accession of King John, of the castle and manor of Warkworth, of the manor of Clavering, in Essex, and of the manor of Eure, in Buckinghamshire, to hold by the service of one knight's fee each. And in that monarch's reign he served the office of sheriff for Northumberland, Norfolk, and Suffolk; for each county thrice. In the conflict between John and the barons, this powerful person, although indebted to the crown for immense territorial possessions, took part in the first instance with the latter, but under the apprehension of confiscation, and the other visitations of royal vengeance, he was very soon induced to return to his allegiance. He was s. by his son, John Fitz-Robert. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 121, Clavering, Barons Clavering]