Gilbert Talbot, of age by 1242/3; Justice of Chester 1255, Custodian of Castles of Grosmont, Skinfrith, White Castle (modern Whitchurch, Salop) 1260; married Gwenthlian, daughter and eventual heir of Rhys Mechyll, feudal Lord of Dynevor, son of Rys Grig, feudal Lord of Ystrad Tywi and Dynevor, younger son of Rhys ap Griffith, Prince of South Wales, and died just before 8 Sep 1274. [Burke's Peerage]
--------------------------
GILBERT TALBOT, heir and probably son, was a minor, 13 April 1234, when his wardship and marriage were granted to John de Monemuth, but was holding Linton and Credenhill, co Hereford, 1242-43. On 23 July 1254 he was to have 6,000 quarrels to supply the castles of Grosmont, Skinfrith and White Castle. In 1255 he was bailiff of Prince Edward, and Justice of Chester; and from 1256 took a prominent part in the defence of the marches against Llewellyn, Prince of Wales. On 5 July 1258 he was given letters of credence to the preceptor and brothers of the New Temple to expound a secret business for the King. On 3 November 1258 he was appointed to keep the county of Hereford, and in that year and until 1262 was in commissions. By writ dated 27 March 1260 he was summoned for service in London. On 15 May 1260 he was given the custody of the castles of Grosmont, Skinfrith and White Castle, and on 24 December 1262 he was directed to fortify them, as also Monmouth Castle, against Llewellyn. In 1262 he was keeper of the lands of Prince Edward. In 1263 he was summoned to be at Hereford with horses and arms on Monday after the Purification. He was granted a protection on 13 August 1265 until Easter following; and on 17 August 1268 was ordered, with others, to be at Montgomery, 14 September, to settle matters relating to the peace with Llewellyn.
He married Gwenthlian, daughter and eventual heir (in her issue) of Rhys MECHYLL, LORD OF DYNEVOR (b). He died shortly before 8 September 1274 and was buried in Wormesley Priory, co. Hereford. M.I. [Complete Peerage XII/1:608-9, (transcribed by Dave Utzinger)]
(b) Rhys Mechyll was son and heir of Rhys Grig, younger son of Rhys ap Griffith, Prince of South Wales.