Born to a family with long experience in Parliament and local office, and heir to a substantial Wiltshire estate, Thynne outraged his parents at the tender age of 16 when he wed without their prior knowledge Maria Tuchet, granddaughter of his father’s hated enemy, Sir James Mervyn [Marvyn]† of Fonthill Gifford. He first met Maria at Beaconsfield on his return to London with his Oxford college friend John Mervyn, Sir James’s nephew, and was so besotted with her that he married her that very evening.
my proud undutiful son who after all these my troubles will be now a counterfoil and revolt, and has to me most undutifully demeaned himself to my no small grief, and for which cause I will also especially stay to see the same either settled or no longer dissembled, and you and yourself no longer abused, for to my face he used me undutifully, and is such cause of contempt of me as I neither can nor will endure, but will put him to the point of either having of her or utterly leaving of her.
Longleat, Thynne Pprs., vii. f. 335.
He tried unsuccessfully to have the marriage annulled in the Court of Arches, while warning his son that ‘with her he shall have nothing but those virtuous qualities she brought from Court.’
On the death of his father in November 1604, Thynne inherited the Longleat estate. However, he was not appointed to his father’s place on the county bench for another 20 years. Early in 1605 he accompanied the earl of Hertford, the family patron, on the latter’s embassy to Brussels.
In November 1607 Thynne was pricked as sheriff of Wiltshire, an office he found onerous, time-consuming and expensive. Further demands were placed on him as steward of the Crown’s manors in Wiltshire the following year by the lord treasurer, and his own large estates required his attention. Assailed on all fronts, in August 1608 he approached Hertford, the county’s lord lieutenant, to be allowed to resign his colonelcy. Hertford, however, was astonished at this request, describing it as ‘peremptory and undutiful’ in a letter to Mervyn, who subsequently persuaded Thynne to stay on. But if it now appeared that Thynne was ready to resume his militia duties, on 2Nov., before the next muster was due, he evaded those duties altogether by moving his entire household to London for the winter, to Hertford’s amazement and annoyance.
In October 1608 Thynne’s title to Caus Castle, in Shropshire, was questioned by the Privy Council, which required him either to provide proof of ownership or to compound. The following year Thynne, then evidently awash with cash, hoped to snap up a barony for as little as £3,000, but instead he was prevailed upon by his brother-in-law, Mervin Tuchet*, 12th Lord Audley, to spend £3,650 on buying the latter’s manor of Warminster. Thynne soon regretted this latter transaction, for in a letter to his wife he complained that the purchase price was so exorbitant that ‘no man would come near it’.
In June 1616 Thynne was once again rumoured to be negotiating for a title. The sale price mentioned - £10,000 - suggests that he was angling for an earldom, but if so nothing came of these overtures.
At the beginning of 1625 the former attorney-general Sir Henry Yelverton* endeavoured to persuade Thynne to part with £8,000 in return for a viscountcy, but despite Yelverton’s confident expectation of success Thynne resisted the temptation.
Following the dissolution of June 1626 the king increasingly resorted to unparliamentary taxes to supply his needs. Thynne contributed £50 to the loans raised by privy seal in 1626,
Thynne was pricked as sheriff of Somerset in November 1629, but instead of residing in his shrievalty as the law required he obtained permission to continue living at Longleat. In 1631, following the expiry of his term of office, it was discovered that he had imposed fines on only a handful of gentry for failing to take up knighthoods, for which offence he himself was fined £200.
Although somewhat lax when it came to discharging the duties imposed on him by local office, Thynne was active in pursuing his own financial interests. He augmented his already extensive estates by the astute management of the royal forests within Wiltshire: as deputy forester for Selwood Forest in 1633, he drew up a survey of royal lands and acquired the lion’s share of those sold off by the Crown, which property was merged with the Longleat estate.
Thynne died on 1 Aug. 1639, leaving extensive properties in seven counties.
Thynne’s portrait, together with those of both his wives, is at Longleat.
