Although Leyot’s background is obscure, it is likely that he was a kinsman of Richard Leyot, D.C.L. (d.1449), sometime vicar of St. Michael’s, Coventry, and dean of Salisbury cathedral, although when, in 1446, the dean placed his moveable possessions in the hands of his relations he only named his cousins Richard, John, Elizabeth and Alice Leyot.
The earliest record of William is his return to the Parliament of 1437 for the Dorset borough of Wareham. There is no evidence that he held property in the town and he may well have been non-resident for within two years he was living at Manston, situated in the north of the county, on the river Stour. As ‘of Manston, gentleman’ in December 1439 he stood surety at the Exchequer for Walter Veer, then given keeping of the priory of St. Helens on the Isle of Wight.
Leyot furthered himself by marriage to the daughter and heiress of his neighbour Thomas Manston, owner of the manor of Manston, a valuable property said to be worth £20 p.a. Margaret, who was still single in January 1446,
In the 1450s Leyot had been engaged in several other lawsuits, including pleas against a man from Stony Stratton, Somerset, for a trespass, and in the King’s bench against a goldsmith from Shaftesbury and pewterer from Gloucester for conspiracy.
