Sir Robert de St. John, d. c 1269, of Basing, Hampshire, Constable of Porcestre Castle & Agnes, daughter of William de Cauntelo, d. 1251, of Calne, co. Wilts, and Eaton Bray, co. Bedford, & Millicent de Gournay. [Ancestral Roots]
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Sir ROBERT DE ST. JOHN, 2nd but 1st surviving son and heir (k), was holding the Honor of HaInaker of the Earl of Arundel in 1242-43. He seems to have served throughout Henry's campaign in Gascony, 1253-54. In August 1257 he was going on the King's service to Wales, and he was summoned for service there, 1258, 1260 and 1263. In Oct. 1261 he was summoned to London, cum equis et armis, and all possible forces, in a matter touching the King and Crown (d). Porchester castle was committed to him, during pleasure, 12 April 1266. He is said to have married Agnes, daughter of William DE CAUNTELO. He appears to have died between 11 March 1266/7 and the 25th of that month (g). His widow (h) married, before 4 June 1271, John DE TURVILLE; they were both living in 1279. [Complete Peerage XI:322-3, (transcribed by Dave Utzinger)]
(k) He had an elder brother Geoffrey.
(d) Two years later he was summoned to Windsor, with the horses and arms which he brought to London. He was appointed Joint Keeper of Hants, Dec 1263. On 14 May 1264--the day of the battle of Lewes, apparently before the fight--he had a safe-conduct for himself and his knights to his own lands. After the battle of Evesham, he was summoned to the King in London, with his whole service.
(g) Col. Patent Rolls 1266-72, which say that he d. in London. He was a benefactor of the abbeys of Titchfield and Netley; and he endowed a chantry in the chapel of St. Laurence in the court of Chawton.
(h) Her marriage was granted, 3 Feb 1269/70 to William Belet, and bought by William la Zouche.