Tuchet’s date of birth is unknown, but he was the elder of two sons. He was born into a family with limited finances but significant social and political connections. His uncle James Tuchet, 13th Baron Audley and 3rd earl of Castlehaven [I], and his father were respected royalist military officers during the civil war years and continued to serve as soldiers during the Restoration. Tuchet followed the family tradition of military service, being made a lieutenant in the regiment of horse of Thomas Tufton, 6th earl of Thanet, in August 1685 and transferring in November 1685 to the regiment of major-general Robert Werden‡. The same month his name was included in a warrant pardoning various officers from the penalties of the acts against recusants for not taking the oaths of allegiance and supremacy. In February 1687, by which time he had succeeded to his father’s English and Irish titles, he was promoted to captain in the regiment of Henry Mordaunt, 2nd earl of Peterborough, a close associate of the king.
As a Catholic, Castlehaven did not attend Parliament under James II. However, contemporaries were clear where his political sympathies lay. His name appeared on four lists relating to the repeal of the penal laws and the Test Act, and to the king’s religious policies, all of which designated him as a Roman Catholic. A watchful eye was therefore kept on his activities. In February 1687 a newsletter reported that the king had bestowed Sir Michael Wentworth’s‡ regiment on Castlehaven, and in April of the same year Edmund Verney reported that Castlehaven had been at Woodstock in Oxfordshire.
Castlehaven’s absence from the House of Lords was noted on 25 Jan. 1689, 31 Mar. 1690 and 2 Nov. 1691. He was also absent from James II’s Irish parliament, which met on 7 May 1689.
An important shift was soon to occur, however, for at the end of October 1697 Narcissus Luttrell‡ reported that Castlehaven had ‘resolved to embrace the Protestant religion’. He attended the Lords on 20 Dec. 1697, which was noted as his first sitting since the death of his father, and duly took the oaths and made and subscribed the declaration, pursuant to the statutes excluding Catholics. Luttrell spelled it out, noting that he had ‘lately abjured the Romish religion’ and took his place as the ‘second baron of England’.
Castlehaven first attended the 1698 Parliament on the opening day of the session, 6 Dec. 1698. On 9 Jan. 1699 he reported a naturalization bill, as he did on the 16th. On 27 Jan. he was named to a conference on the bill to prevent the export of corn. On 20 Feb. he reported a bill allowing several ships to trade as free ships, as well as a naturalization bill. He attended 54 sittings in the session (63 per cent). In March 1699 he received a further £200 royal bounty and at the end of May a pension of £300 p.a. backdated to March.
Castlehaven first attended the 1699–1700 session on the opening day, 16 Nov. 1699. On 6 Dec. he reported from a committee on whether, when the attorney-general was heard on the king’s behalf, the counsel of the other parties might be present. This was part of the proceedings in the case against Thomas Watson, bishop of St Davids; following the report, it was voted not to allow the bishop his privilege.
Castlehaven attended the prorogation on 1 Aug. 1700 but died shortly afterwards of an apoplexy at Winchester on 9 Aug.; he was buried in the cathedral the following day.
