General Notes

Henry de Grey; bought the Manor of Thurrock, Essex (later called ThurrockGrey) 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]

Sir Henry de Gray was in great favor with Richard I, Coeur de Lion, as is manifested from the grant which that prince made to him of the Manor ofTurrock, or Turroc, in Essex, afterwards called Thurrock Grey; whereofalso he had a confirmation by King John, with whom he continued in greatestimation. In the 8th of Richard I, William de Brewere, Sheriff, gaveaccount of 100s of Henry de Grey scutage for five knights' fees, becausehe was in the King's service beyond the sea. In 13th of King John, Henryde Grey held six knights' fees of the honour of Peveral. In 1st of HenryIII he had a grant of the Manor of Grimstone, County Notts, from RobertBardolph, for his support in the King's service. This Robert Bardolph died 9th of Henry I (1225), when the said Henry de Gray married Isolda,daughter of Hugh, and niece and heir of the said Robert, brother of Hugh,shared with Maud Bardolph and others. all the lands of said Robert. They had six sons: Richard, whose principal seat was at Codnor, County Derby;John, Justice of Chester; William; Walter, Archbishop of York, and Henry.

Complete Peerage: Volume 6: Grey of Codnor
Volume 6, page 123: SIR HENRY DE GREY [d.1308] ... was a minor at his father's death.(b) Note b: Cal. Inq. p. m., Hen. III, no. 810. His age as given in the inquisitions varies from 14 to 17.
The writs for the inquisitions after the death of Henry's father were dated 5 and 25 January 56 Henry III [1271/2], and the inquisitions were taken in January and February. Most give Henry's age as 13, 14 or 15, and one as 17.
Page 124, note e: [In his will] he [Sir Henry de Grey (d.1308)] mentioned his da. Luce de Somery [who m. a son of Roger de Somery (Anc. Corresp., 26/36), of the marriage of whose heirs he had had a grant (Cal. Patent Rolls, 27 Dec. 1292)]
The marriage was granted to John de Bretagne, 27 December 1291, and an additional note records a subsequent grant to Henry de Grey [Cal. Patent Rolls, 1281-1292, p.464]. Sir Henry's daughter, Lucy de Somery, was evidently the wife of John de Somery (d.1322) [see Somery  vol.12, part 1, p.115].

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In the 6th year of King Richard I [1195], that monarch conferred themanor of Thurrock, co. Essex (afterwards called Thurrock Grey), uponHenry de Grey, which grant was confirmed by King John, who vouchsafed, byspecial charter, to permit the said Henry de Grey to hunt the hare andfox in any land belonging to the crown, save the king's owndemesne-parks. In the 1st Henry III [1216], he had also a grant of themanor of Grimston, co. Nottingham, and having afterwards m. Isolda, nieceand heiress of Robert Bardolf, shared in the inheritance of his lands. Bythis lady Henry de Grey had issue, Richard, John, William, Robert,Walter, and Henry. [Sir Bernard Burke, Dormant, Abeyant, Forfeited andExtinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p.247-248, Grey, Baron Grey, of Codnor, co. Derby]