 Devereux was assigned on 12 June 1481 to survey the land of the king's lordship of Cheshunt, Hertfordshire; the land of Thomas, abbot of Waltham, in Essex; and the boundary between the counties there.As a member of the Council of Wales, Walter Devereux was probably with Edward V when he was declared king following the sudden death of Edward IV on 9 April 1483.It would be expected that he accompanied Edward as he set out for London, and was probably among the retinue that was dismissed when Richard, Duke of Glouucester intercepted them at Stony Stratford, Buckinghamshire on 29 April.