The Chronicle of Tintern Abbey, Monmouthshire records that "Gilbertus de Lacy" had a son "Hugonem" who had "filium Walterum", who in turn had "filium Gilbertum de Lacy". A manuscript which narrates the descents of the founders of Lanthony Abbey names “Gilbertus de Lacy” as son of “Walterus de Lacy” and his wife. An undated charter of Henry III King of England confirmed a donation by ”Walterus de Lacy” to the Hospital of Ludlow, Shropshire, for the souls of “Margeriæ uxoris meæ…Gilberti de Lacy filii mei”.
The Annals of Tewkesbury record the death in 1230 of “Gilebertus de Lacy filius et hæres Walteri de Lacy” and his burial “apud Lantone in Wallia”. The Annals of Worcester record the death in 1230 of “Gilbertus de Lacy”. 1
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Only son, Gilbert was one of the hostages demanded by John after Walter's return from his second period of exile in 1213. On attaining his majority, Gilbert was granted his father's Herefordshire lands. This must have been by 1228, for in that year there is a release to Gilbert of the lands of Stephen Devereux (d'Ebroicis) that were part of his fee. A number of Gilbert's charters relating to his Herefordshire lands are to be found in the dean and chapter records. In September 1228, along with such other local dignitaries as John de Balun and Walter Baskerville, he was summoned to New Montgomery for service under the justiciar, Hubert de Burgh, in the disastrous Kerry campaign. By this time Gilbert was himself in debt to the Jews, for eighteen months later, in May 1230, the king pardoned the interest on these debts whilst he was on the royal service in France. Apparently it was there that he died, for in December Walter was given possession of 'all the lands of his son, now dead, which were of his grant'.
Gilbert left three children, two daughters and a son, Walter. In 1238 this young boy was formally recognised by Walter as his heir, but he died before his grandfather. Thus, on the latter's death in 1241, the estates passed out of de Lacy hands when they were divided between his two granddaughters, Matilda and Margaret, married respectively to Peter de Geneva and John de Verdun. 2
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3 Apr 1228, Reading
Pro Gileberto de Lascy.—Mandatum est vicecomiti Hertf' quod dominus rex replegiavit Gileberto de Lascy terram que fuit Stephani de Ebroicis et est de feodo ipsius Gileberti, et quam dominus rex in manum nostram capi fecit, usque ad diem dominicam proximam ante Ascensionem Domini, quia dominus rex dedit ei diem ut tunc sit coram ipso ad respondendum ei super hiis que de custodia ejusdem terre ei proponet...
Calendar of Close Rolls, vol. 1, 12 Hen. III, p. 32
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25 Dec 1230
Pro Waltero de Lascy.—Quia rex didicit quod Walterus de Lascy non demisit se de terris illis quas Gilebertus de Lascy, filius suus, tenuit in comitatu Heref', et quod idem Gilebertus terras illas tenuit de ballio ejusdem Walteri ad se sustentandum; mandatum est vicecomiti Heref', quod de omnibus terris que fuerent in manu predicti Gileberti de ballio predicti Walteri patris sui, et que capte sunt in manum regis occasione mortis predicti Gileberti, eo quod credebatur quod predictus Walterus se demisisset de toto de eisdem terris, eidem Waltero plenam saisinam habere faciat; et si quid inde receperit de terris predictis, id ei reddi faciat.
Calendar of Close Rolls, vol. 1, 15 Hen. III, pp. 464-465
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25 Oct 1241, Westminster
Grant to Guy de Russillun of the marriage of Maud daughter of Gilbert de Lacy, one of the heirs of Walter de Lacy, and if in process of time she be impleaded in respect of her purparty of the lands of the said Walter and lose it, after he has married her, the king will have respect to the said Guy as becomes both him and the king.
Calendar of Patent Rolls, Hen. III, vol. 3, p. 261