John Devereux is identified as a witness to a grant of a croft in 1317 in the town of la More (Hereford) by Thomas Swonild to Thomas de Houton (and his sons, Walter and Hugh) between the lands of his father, Sir Walter Devereux, and the Tyne brook. On 11 December 1323 a commission of oyer and terminer was called to investigate a complaint by Richard de Portes that ‘John Deueres’ was among a group of men that assaulted him at Gloucester, and broke the gates and doors of his houses at Bromesberwe (Yockeford), and Dunhampton (county Gloucester), cut down his trees and carried them and other goods away. He came of age in 1323, He was listed among a number of Hereford men who testified about the actions of Mortimer's men and accomplices, and the complicity of the Bishop of Hereford in their action. His brother, Stephen Devereux, was listed among the jurors. On March 6, 1327, John Devereux was described as the king's yeoman. He was granted the bailiwick of the ‘chace of Cors’ in county Gloucester. On 26 July 1327 Hugh fitzThomas and Hugh fitzSymond recognized a debt of 30 shillings to John Devereux. On 20 September 1332 a grant for three years was given to William de Leversete and John Deveroys of the right to take customs specified in the letters patent on goods for sale brought to the town of Ideshale and Welynton, county Salop, and passing through those towns or along the highway between them, for repairing the causeway. This was renewed on 8 December 1335 for another 3 years. Also in 1335, John Devereux along with Stephen Devereux and Roger Devereux witnessed land transactions in Whitchurch Maund, and Rosemaund in the parish of Bodenham. John Devereux participated in
Edward III's invasion of France in 1346 as part of the retinue of
Laurence Hastings, 1st Earl of Pembroke, and was present at the
Battle of Crécy. He died shortly after this time. ==Marriage==