Henry de Grey; bought the Manor of Thurrock, Essex (later called Thurrock Grey) from Isaac the Jew and his son Josce; held the Manor of Codnor, Derbys by 1201; granted by Henry III 1216 the Manor of Grimston, Notts. [Burke's Peerage]
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In the 6th year of King Richard I [1195], that monarch conferred the manor of Thurrock, co. Essex (afterwards called Thurrock Grey), upon Henry de Grey, which grant was confirmed by King John, who vouchsafed, by special charter, to permit the said Henry de Grey to hunt the hare and fox in any land belonging to the crown, save the king's own demesne-parks. In the 1st Henry III [1216], he had also a grant of the manor of Grimston, co. Nottingham, and having afterwards m. Isolda, niece and heiress of Robert Bardolf, shared in the inheritance of his lands. By this lady Henry de Grey had issue, Richard, John, William, Robert, Walter, and Henry. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 247-248, Grey, Baron Grey, of Codnor, co. Derby]