Nothing is known of Kelsy’s origins. He first appears in the records on 8 Oct. 1439, when Robert Neville, bishop of Durham, granted him a minor wardship without payment.
No doubt Kelsy’s election to represent the Westmorland borough of Appleby in the Parliament of 1447 was also an aspect of his service to the bishop, for he, like most of that borough’s MPs, had no interests there.
By the late 1440s Kelsy was one of Bishop Neville’s most intimate servants. This explains why, on 6 Oct. 1450, the bishop was prepared to allow him a long lease of one of his principal properties, the manor of Crayke in the North Riding of Yorkshire; he was to hold it for the term of 40 years at an annual payment of £10 to the bishop together with a further £14 5s. p.a. to the bishop’s steward and parkers there. The extensive building that Neville was undertaking at Crayke – he was responsible for the still-surviving solar tower there – makes this lease an indication of special favour.
By this date Kelsy was probably acting as steward of the bishop’s household. No record of his appointment survives: it is known only that his last account as steward terminated on 12 May 1455. This showed a debt of over £487 to various creditors both for provisions and loans raised by Kelsy on the bishop’s behalf, and on the following 27 Sept. Neville gave him power to raise this sum from the lands of the bishopric.
This, however, is Kelsy’s last appearance in an active role, and there is some indirect evidence to suggest that he died soon afterwards. Three times in 1455 he had offered mainprise when the Darcy lands were committed to the keeping to William Claxton of Old Park (Durham); when, on 1 Mar. 1456, this grant was renewed his place as surety was taken by William Kelsy, who, it may be inferred, was his son.
