We know from the MP’s will that his father was John Kayleway of Sherborne, probably the man who regularly served on juries at inquisitions post mortem held in the town in the 1420s, and who attested the Dorset elections of 1432.
By then Kayleway may have contracted his potentially lucrative marriage to Joan Lederede, the widow of a former coroner of Somerset. In the assessments for the tax levied in 1436 he had been put down as receiving just £5 p.a. from his land in that county,
In the 1450s and 1460s William was engaged in private legal work. He and John Kayleway had been associated with the influential lawyer John Newburgh II* in a suit in 1454 against William Ludlowe II* of Ludgershall, Wiltshire, and his future wife Margaret Warmwell, a widow from Salisbury, for a breach of the statute of Westminster regarding illegal entry into land in Charleton by Knowlton. This they successfully recovered in the following year.
Kayleway died just a few weeks before the earl, although there is nothing to indicate that he accompanied Stafford’s army on its way north to confront Edward IV’s rebels. In his will made on 21 May 1469 he left the parish church at Sherborne his new missal, which was to be well and suitably illuminated and bound at his expense, and small bequests to Sherborne abbey, the important almshouse there, Henton priory, and the white friars at Bristol. To his son William (one of his executors) he left his two best horses, and a silver-gilt chalice, his second missal, his breviary and all the other contents of his oratory in his house at Sherborne, as well as a silver cup which the mother of his first wife had given him, and a ‘Bollecupe’, which items were to remain as family heirlooms. Other bequests favoured William junior’s young children: John was to have his grandfather’s lands in Bristol and in Yeovil, Somerset, entailed on his male issue, with remainder to his brother William in tail-male, their father William in tail-male, and finally to the testator’s right heirs, while Kayleway’s two grand-daughters were each to have £40. As his seal was not well known, he procured that of Tarrant abbey to be fixed to the will. This was proved on 1 July,
