In the time of William the Conqueror, the brothers, Roger and Robert, mentioned in Doomsday Book as sons of Corbet, held of Roger de Montgomery divers lordships in the co. of Salop, and were munificent benefactors to the church. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 136, Corbet, Barons Corbet]