That Wilcotes was an illegitimate son is strongly suggested by the arrangements made by his father for the disposal of his estates in 1422. Although Thomas was left certain lands and tenements in Tetbury and Charlton in Gloucestershire and Evesham in Worcestershire, he received only a reversionary interest in his father’s principal manors of Great Tew, Dean, and Upper and Lower Chalford, which were instead to be inherited by John’s daughters, Elizabeth and Margaret, then aged about four and two years respectively. Had he been of legitimate birth, Thomas would have stood to inherit Great Tew under the terms of an entail of 1398.
Little is known of Thomas’s early life, but it seems that he sought to forge for himself a career on the battlefields of France. To this end, he indentured to join the force sailing to Aquitaine under the command of John Holand, earl of Huntingdon, in 1439, and two years later he concluded a similar agreement to serve under the newly appointed lieutenant of France, Richard, duke of York, in the retinue of Sir William Oldhall*.
Wilcotes, despite his illegitimacy, was now an important man and in a position to exploit some of the ties established by his father, most notably with the Stafford family. In November 1449 he was returned to Parliament for the Surrey borough of Bletchingley, almost certainly at the instigation of Humphrey, duke of Buckingham, to whom the lordship of the borough pertained.
Relatively little else is recorded of Wilcotes’s career during the 1450s and 1460s. Although he maintained links with the Bourgchiers, standing surety in the Exchequer for Lord Berners in November 1462, he never matched his father’s prominence, and failed ever to attract appointment to Crown office. Nor was he much sought after as a feoffee or witness to property transactions. Indeed, at some point before 1465 he was sued in Chancery by one Alice Alkerton over his failure to release land at Shorthampton, Chilston and elsewhere to her.
By the late 1460s Wilcotes had made the decision to use his property at Chalford to endow Oriel College, Oxford. An agreement to this effect was eventually drawn up on 10 Nov. 1471, under the terms of which Oriel would receive the manor from trustees, in return for various pious works. Wilcotes agreed to enfeoff John Carpenter, bishop of Worcester, and others on the understanding that he should have the issues and profits during his lifetime and that on his death they should make an estate to Oriel. The college, for its part, undertook to find a chaplain to celebrate mass daily in its chapel for the souls of John Wilcotes and his wives and daughters, and also for the souls of Thomas and his wife Eleanor. The couple were also singled out for remembrance at services held at the parish church at Great Tew, where Thomas’s father lay. The college also agreed to fund Wilcotes’s obit in Spelsbury church.
Wilcotes died on 15 Mar. 1472 and was buried in the church at Great Tew, where a memorial brass styled him ‘Thomas Wylcotes de Deyne, generosus’.
