Sir Robert St. John Knight, Constable of Porcestre Castle

  General Notes:

From Weis's Ancestral Roots, 262:31, for Alice St. John:

Sir John de St. John, d. 20-29 Sep 1302, of Basing, Hampshire, Constable of Porcestre Castle, Seneschal of Gascony, Seneschal of Aquitaine, son & heir of 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.¹⁶⁰


A manuscript recording the founding of Boxgrove Priory, Sussex names "Agneta filia Willielmi de Cantilupo" as the wife of "Robertum", son of "Willielmum secundum," Dugdale Monasticon, Vol. IV, Boxgrave Priory, VI, p. 646. ¹¹⁷⁸

  Information about this person:

• Background Information. ¹⁴¹
Sir Robert de St. John, 2^nd but 1^st surviving son and heir, 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 Aug 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. Porchester castle was committed to him, during pleasure, 12 Aprl 1266.

Robert de St. John is said to have married Agnes, daughter of William de Cauntelo. He appears to have died between 11 Mar 1266/7 and the 25th of that month (*). His widowmarried, before 4 Jun 1271, John de Turville; they were both living in 1279.

(*) According to Col. Patent Rolls 1266-72, he died 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.

~Cokayne's The Complet Peerage, Vol. XI pp. 322-323

Robert married Agnes de Cantelou, daughter of William de Cantelou Steward to the Household of King John and Mesceline de Braci ¹⁴¹.^,160 (Agnes de Cantelou died after 1279 ¹⁴¹.)