At least two other prominent landowners named John Boys were active in the south-east during the early 15th century, and it is not always possible to distinguish either of them from the subject of this biography, whose early life, before he was knighted, remains somewhat obscure. That John Boys (d.1419) the elder, of Tolleshunt D’Arcy in Essex, and his son, John (d. by 1427), were related to the shire knight seems almost certain, especially as the latter too owned property in Essex.
Despite these problems, Boys and his wife enjoyed a substantial joint income from the time of their marriage. As early as 1412 their tenements in London were said to be worth £15 5s.4d. a year; their manor of Well and land in Farley Chamberlayne, Hampshire, produced a further £20; and they were sure of at least £5 in profits from Boys’s estate in Harrow and Kingsbury, Middlesex. On the death of Thomasina’s father, the couple inherited his manor of Uxendon, in the same county; and at some unknown date they acquired premises known as Le Belle in Southwark. By 1436, Boys’s annual revenues from land in Middlesex, Surrey (the manor of Farnham), Hampshire, Essex (the manor of Boyton Hall) and London were assessed for taxation purposes at £59 and may well have been considerably higher.
Boys was knighted before November 1418, when he also began an unbroken term of 21 years on the Middlesex bench. Having been returned to the Commons for that county in 1420 he went on to attend the parliamentary elections held there in 1421 (in both April and November) and 1423; but he then became more fully involved in local government in Hampshire, which he represented in the Parliament of 1426, barely a month after relinquishing office as sheriff. A connexion with Bishop Beaufort of Winchester may perhaps explain his return for the latter county, since the bishop was then embroiled in a serious quarrel with Humphrey, duke of Gloucester, and badly needed support in the Commons. Sitting ex officio as a j.p., Boys had already served on a commission of oyer and terminer set up to examine certain affrays between the rival factions, and no doubt used his position to help the bishop. He probably continued to spend most of his time in Middlesex, however, for in September 1426 large quantities of silver plate and other valuables were stolen from his house in Harrow. He appears among the leading residents of that county who, in May 1434, were instructed to take an oath not to maintain persons breaking the peace, and ten years later he held his last public office as a commissioner of array in Middlesex.
