He served in Wales in 1277 under the command of the Earl of Lancaster.[2] Kingston was in Wales in 1282 and in Flanders in 1297 on military service.
As one of King Edward I's leading commanders, he was Governor of Edinburgh Castle from 1298 to 1300 and from 1301 to at least 1305 (possibly as late as 1310).[3] He was a signatory of the Baron's Letter to Pope Boniface VIII in 1301. John and his brother Nicholas were captured during the battle of Bannockburn on 24 June 1314. He was the Sheriff of Somerset from 1315 to 1317.[4]
^Foster, Joseph (1994). The Dictionary of Heraldry. Feudal coats of arms and pedigrees. London: Studio Editions. p.122.
^Great Britain. Record Commission (1827), The parliamentary writs and writs of military summons : together with the records and muniments relating to the suit and service due and performed to the King's High court of Parliament and the Councils of the realm / collected and ed. by Francis Palgrave ; Printed by command of His Majesty King George IV
^Dunning, Robert (1983). A History of Somerset. Chichester: Phillimore & Co. pp. 109–117. ISBN0-85033-461-6.
^'Sutton Veny', in A History of the County of Wiltshire: Volume 8, Warminster, Westbury and Whorwellsdown Hundreds (London, 1965), pp. 61-74. British History Online http://www.british-history.ac.uk/vch/wilts/vol8/pp61-74 [accessed 18 May 2023].
^Grant, Memorials of the Castle of Edinburgh, p. 280
^Chalmers, G (1902). "v. 8". Caledonia: Or, A Historical and Topographical Account of North Britain, from the Most Ancient to the Present Times with a Dictionary of Places Chorographical & Philological. Gardner. p. 164.
^Parishes: Kingston Bagpuize', in A History of the County of Berkshire: Volume 4, ed. William Page and P H Ditchfield (London, 1924), pp. 349-353. British History Online http://www.british-history.ac.uk/vch/berks/vol4/pp349-353 [accessed 17 May 2023]
