Robert de Grey, 4th son of Henry de Grey, of Thurrock, obtained from his brother, Walder de Grey, Archbishop of York, a gift of the major part of the lordship of Rotherfield, co. Oxford. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 24, Grey, Barons Grey, of Rotherfield, co. Oxford]