King Henry I confirmed the Barony of Graystock unto Phorne, son of thesaid Lyulphe, whose posterity took their surname from the place, and werecalled de Greystock. Phorne was s. by his son Ivo. [Sir Bernard Burke,Dormant and Extinct Peerages, Burke's Peerage, Ltd, London, 1883, p. 254,Greystock, Barons Greystock]