Like many of his friends and relations, Thomas supported Parliament during the 1639–1652
Wars of the Three Kingdoms. In the late 1640s, he served in the
New Model Army in England and
Ireland and established businesses first in
Dromore, County Down, then later in
Lisburn. The
1641 Irish Rebellion led to military interventions by the Scots and English Parliament, which were financed by the March 1642
Adventurers' Act. One of the last pieces of legislation approved before the English Civil War began, this raised loans to be repaid by the sale of lands held by the Irish rebels; enforcing it was one of the primary objectives of
Cromwell's war in Ireland. A number of different subscriptions for the Adventurers loans were opened between 1642 and 1647, and although the Lascelles family are not listed by name, many subscribed by forming syndicates and sold their interests prior to lands being allocated by the
1652 Act of Settlement. It seems likely Thomas was involved, since both he and his brother Francis had business interests in
Ulster, while another branch of the family was established in
Killough, County Down. He invested his profits in purchasing the manor of
Northallerton from the
Bishop of Durham in 1649, followed in 1653 by
Mount Grace Priory, a former
Carthusian monastery suppressed in 1539. He converted parts of the remaining buildings into what is now a rare example of architecture from the 1649 to 1660
Commonwealth. In 1660,
Charles II was restored as monarch and in April, Thomas and Francis were elected to the
Convention Parliament as
Members of Parliament for
Northallerton. In June, the two deemed it prudent to resign their seats and go into temporary exile in the
Dutch Republic. Cromwell, Bradshaw, and Ireton 1660; the involvement of his brother Francis in the trial of Charles I led to a short exile in Holland While a key player in negotiations leading to the
Restoration, Francis was also a member of the
High Court of Justice that condemned
Charles I to death in 1649. Although neither present when sentence was passed nor a signatory of the death warrant, he was clearly a target, especially after the
Regicides were excluded from the
Indemnity and Oblivion Act. Many were condemned to be
hung, drawn and quartered, while the corpses of
Cromwell,
Bradshaw and
Ireton were dug up and dragged to
Tyburn gallows. The executions were halted only when ministers grew concerned by public reaction to the deaths. Even
Pepys, who was closely connected to the new regime, recorded his admiration for the conduct of
Thomas Harrison at his execution in October 1660. The Lascelles were indemnified and allowed to return home, although Francis was fined and perpetually barred from holding public office. The brothers were later accused of involvement in the Northern Rising, a conspiracy of some 100
Anabaptist former soldiers and radicals centred on Northallerton and
Leeds. In December 1662, the two were briefly held in
York Castle but the 'Lascelles Plot' was soon shown to have been fabricated by government informers while the Rising in October 1663 quickly collapsed. , where Thomas and other family members was buried The 1665 to 1667
Second Anglo-Dutch War was opposed by many former Parliamentarians on both commercial and political grounds and Thomas was one of those held in preventative detention during the invasion scare of 1666. While not directly involved in the 1679 to 1681
Exclusion Crisis, he ensured Northallerton returned anti-Court MPs and his house was searched for weapons after the 1683
Rye House Plot. In the 1688
Glorious Revolution, his nephew Daniel served in the force led by
Lord Danby that secured
York and
Hull for
William III. After a gap of nearly thirty years, Thomas was re-elected MP for Northallerton in 1689 and loaned money to the new regime, which do not appear to have been repaid. He remained an MP until his death in 1697, although with minimal involvement, and was appointed Housekeeper of the
Excise Office in 1693. When he died in November 1697, his family had to seek assistance from Parliament in settling his estates; in April 1698, the
House of Lords introduced, "An Act for vesting the Real Estate late of Thomas Lassells Esquire deceased, in Trustees, to be sold, for the Payment of his Debts." The process was not completed until March 1699, when his widow was given permission to dispose of lands and houses in
Ealing,
Middlesex. Thomas was the only member of his family to live at Mount Grace; it was rented out in 1701 before being sold by Robert Lascelles in 1744. ==References==