The Tregasowes were an old Cornish family, documented in local deeds by the 1330s, who probably took their name from the family seat in the parish of St. Erme in central Cornwall. At the time of Oliver’s only documented return to Parliament his father was still alive and attested the sheriff’s indenture recording the results of both shire and borough elections, as he did also on two other occasions, in April 1421 and 1433. In March 1430 the two Tregasowes appeared together at the Cornish assizes as joint tenants of a tenement, possession of which they successfully defended against one Robert Braun.
It is possible that these holdings formed part of the estates which came into Tregasowe’s hands by virtue of his marriage to a potential heiress, a descendant of one of the branches of the prolific Moyle family, for Oliver was later to sign away his title to the manor of Trewall to (Sir) Walter* and Roger Moyle.
Tregasowe is not known to have held any property within the town of Truro, by virtue of which he might be said to have fulfilled the statutory requirement of residence imposed on MPs, but he was probably considered a local man on account of some of the family possessions in the neighbouring parishes of Kea, Probus and Cornelly. In the year when he was elected by the men of Truro, Oliver was himself present at the shire elections at Lostwithiel and attested the election indenture with the sheriff. There is no record of his activity in the Commons, but it is possible that he retained an interest in parliamentary affairs, for he was later present at no fewer than three further elections.
There is no definite evidence to show whether Tregasowe consciously took sides in the troubles of the years 1459 to 1461, but his activities in the early months of Edward IV’s reign may indicate a level of hostility to the new regime, or at least a degree of opportunism on his part. Within a few weeks of the new King’s accession, on 28 Apr. 1461, he and his son Stephen with a band of armed men ‘off the most mischevys & riottest disposed people þat be in any countre’ entered the lordship of Pawton, part of the temporalities of the Yorkist chancellor, Bishop Neville of Exeter, and began a concerted campaign of harassment against the tenants, driving off their livestock, slaughtering some of the fattest oxen for their own use, smashing the windows and doors of the houses and threatening the tenants’ families. These attacks continued until the following autumn, when Stephen Tregasowe attacked the bishop’s bailiff, Nicholas Goly, whom he deprived of a purse containing £7 of Neville’s rents, and another episcopal servant, Richard Lannargh, who claimed to have been robbed of £40 in ready money. Probably on account of the continued unrest throughout the realm, Bishop Neville’s reaction was slow, and it was not until September 1462 that royal commissioners were appointed to arrest the Tregasowes.
Tregasowe was still alive in 1466, when his possession of a tenement in Penryn was challenged by Richard Lannargh, but by this date he must have been a very old man, since even in 1449 he had been thought to be more than 60 years old. He died not long after, for by 1480 his property at Trelavour (in St. Dennis) was in the hands of his heirs.
