The MP may have been a descendant of a namesake who in 1386 had dealings concerning the Wiltshire manor of West Harnham, and in the following year acquired lands in Pitton, Farley and Alderbury, all near the city of Salisbury.
Penston, usually described as a ‘gentleman’, made his career as an attorney, starting off by taking briefs at the assizes held at Salisbury in the 1420s,
Penston was listed in 1434 among the men of Wiltshire required to take the generally-administered oath not to maintain those who broke the law, and he once more attested the shire elections in the following year.
By that date Penston had become increasingly involved in the administration of Salisbury. In 1436 he had been assessed in St. Martin’s aldermanry for a contribution to the cost of the armed force required for the relief of Calais, and in later years he made similar contributions towards loans demanded from the city by the Crown, and for local works. Even so, he was not counted among the wealthier citizens, and paid no more than 3s. 4d. towards the loan of £40 granted by Salisbury in 1444, and nothing at all towards another raised four years later.
At one such convocation held in Salisbury in October 1449 and attended by Penston, he himself was elected with William Swayn* to represent the city in the Parliament summoned to meet on 6 Nov. The two men agreed to take half the normal wages of 2s. a day, unless the mayor and commonalty deemed they were to be otherwise remunerated according to their deserts and in return for their labour. (After the close of the Parliament and some delay half-wages was all they received. This was probably not due to any failings on their part, but rather the authorities’ response to the long duration of the Parliament.)
It was not until six months after his parliamentary service was over that in November 1451 Penston was finally elected and sworn to the 24.
Penston served as a juror at the inquisition post mortem on John Stourton II*, Lord Stourton, conducted at Salisbury early in 1463,
Penston was appointed a tax collector in Wiltshire for the second time in 1468, and it was partly to obtain exoneration from any failings in performing this task that on 5 May 1472 he took out a pardon (as ‘of Salisbury, gentleman, and formerly of London’).
Penston died on 1 Jan. 1478. By a settlement of August 1472 he had arranged that after his death his manor of Winterbourne Cherborough should pass to his daughter Joan, wife of Thomas Burton, and her issue, with remainder to his bastard son Simon. In the event, Joan predeceased him, so his heir was his six-year-old grand-daughter, named after her mother. John Aport, the Salisbury merchant, took the profits of Penston’s lands at Stratford sub Castle after he died, perhaps doing so as the little girl’s guardian.
