Botreaux was probably a junior scion of the baronial family of that name, although it has not been possible to determine his exact descent from the senior line. Although it is just possible that his father, Ralph, was the shire knight of that name, a younger son of William, Lord Botreaux (d.1391), this seems unlikely, as a settlement made by the MP’s daughter at some point before 1469 failed to style her grandfather a knight. It is possible that either William or his father was of illegitimate birth, or that their cadet line had split from the main branch of the family several generations earlier, since William was omitted from the elaborate entail of the Botreaux lands made in 1428.
The full extent of Botreaux’s landholdings is uncertain, but it seems that his father endowed him with property in Cornwall which he had acquired by purchase from the Smallhill family.
It seems that Botreaux was a more substantial man than his relatively limited career of office-holding suggests, for in 1434 he was deemed to be of sufficient standing to be included among the Wiltshire gentry obliged to take the general oath against maintenance.
It seems that Botreaux took a degree of interest in parliamentary affairs, for even prior to his own first return to the Commons he had been present at the Wiltshire elections of 1420 as well as at those held in Somerset for Henry VI’s first Parliament, and attested the election indentures. He would later do likewise in the Wiltshire county court on no fewer than four occasions, and once in Worcestershire. It is, by contrast, less certain how he himself came to be returned by the burgesses of Wilton, who normally showed a predilection for local men, and it is possible that it was his noble kinsman, Lord Botreaux, who was able to exert some influence on his behalf. Equally, he may have possessed other ties in and around Wilton: on 1 Dec. 1429, when his first Parliament was in session at Westminster, he (in association with three Salisbury men, William Russell and the lawyers Henry Bradley and Edmund Penston*) he was in receipt of sureties of £500 from the Hampshire gentleman Robert Peny of South Tidworth, in a dispute or transaction the details of which have not come to light.
Botreaux made his will on 1 Mar. 1449. He asked to be buried in the chapel of Lymington, to which he made a bequest of 40s. Lord Botreaux was to have the testator’s best silver cup, and other similar items went to Thomas atte Welle and another kinsman, Robert Botreaux, who was also to have a horse. His widow, Agnes, was left all his household goods, while his daughter, Joan, still under age, was to receive £20 should she live to see her fourteenth birthday. The execution of the will was entrusted to Thomas Ringwood. Probate was granted on 30 Apr., and on the following 4 July the executor was discharged of his responsibilities.
