For this John Devereux gave him 11 marks of silver. In 1286 John Devereux was back in Gloucester where he witnessed documents for Reginald fitzPeter. When further rebellion broke out in Wales, Devereux was again granted on 23 July 1287 clause volumus while on the king's service in Wales. On 26 June 1289 John de le Ok, son of Miles de Sweyneston, acknowledged a debt to John Devereux of 11 pounds to be levied in default of payment of his lands and chattels in county Hereford. On 15 May 1290 John Devereux was one of the sureties for William de Mortimer, Parson of the Church of Eastham (Worcester), acknowledging the debt to Roger la Zouch of Lubbesthorpe of 80 pounds to be levied, in default of payment, of his lands and chattels in counties Worcester and Essex. On 25 November 1287 Sibel, widow of William de Warham, remised and quitclaimed to John Devereux and his heirs 1 messuage and 1 virgate of land in Warham (in Breinton), excepting 6 acres of land. For this John gave her 10 pounds of silver. On 1 July 1289 Margery de la Walls acknowledged tenements in Ledbury (Wall Hills and Plaistow), and Coddington to be the right of John Devereux, and rendered them to him and his heirs in court. Also Margery granted half a virgate and 6 acres of land and 10 shillings of rent, which Walter and Isabel de la Walls held for the life of Isabel of the inheritance of Margery, to remain to John and his heirs. Margery further granted half a virgate of land, which Robert and Cecily de la Heath held in dower of Cecily of the inheritance of Margery, to remain to John and his heirs. Also in September 1290 Devereux was called as witness in a court case contesting the ownership of 'Donewaldeslond' between the heirs of Philip of Wastellion and John de Hastings, 1st Baron Hastings. John Devereux testified that he knew the Welshman, and that his parents did too. He and his father often came to Philip's house, and heard that Philip had performed homage to the King for the contested land which had been held by Philip's ancestors. John also testified that the Welshman held of John de Hastings 3 bovates of land in other parts of Wales.