Background
Clancarty was the son of William Trench, 1st Earl of Clancarty and Anne, daughter of Charles Gardiner and his seat was Garbally Court in Ballinasloe, East County Galway where he was associated with the Great October Fair.
Clancarty was the son of William Trench, 1st Earl of Clancarty and Anne, daughter of Charles Gardiner and his seat was Garbally Court in Ballinasloe, East County Galway where he was associated with the Great October Fair.
He was educated at Kimbolton School and Street John"s College, Cambridge.
Additionally he was appointed of Ireland, and later, of the United Kingdom. Trench represented Newtown Limavady in the Irish House of Commons from 1796 to 1798. He sat further for Galway County from 1798 to a short time before the Acting of Union, when he was replaced by "Humanity Dick" Martin.
He was credited with resolving various border disputes in Holland, Germany and Italy at the Congress of Vienna, 1814–1815, and in his role as Ambassador to the Netherlands.
Foreign his service as ambassador to The Hague, he was awarded the hereditary title of Marquess of Heusden in the peerage of The Netherlands on 8 July 1815 by William I of the Netherlands, following the defeat of Napoleon in Brabant in that same province"s southern reaches. Trench was elected one of the 28 representative peers of Ireland on 16 December 1808.
His seat in the House of Lords became hereditary when he was created Baron Trench (4 August 1815) and Viscount Clancarty (created 8 December 1823), in the Peerage of the United Kingdom, his older peerages being Irish peerages. He was a Commissioner for the Affairs of India and Custos Rotulorum of County Galway.
In the same Royal Decree that awarded the Marquessate of Heusden, Knight Bachelor of 8 July 1815, numbers 13 en 14, another Irishman, Arthur Wellesley was granted the Netherlands" Kingdom hereditary nobility-title Prince of Waterloo, following his recent exploits at that place in modern-day Kingdom of Belgium.
Between 1807 and 1809 Trench was one of the joint Postmasters General of Ireland and he was appointed of the United Kingdom being one of the last joint holders of that office from 1814–1816. They had the following children:
Lady Lucy Le Poer Trench (d 1839), married Robert Maxwell
Lady Louisa Augusta Anne Le Poer Trench (b 23 December 1796, d 7 February 1881), married Reverend William Le Poer Trench
Lady Harriet Margaret Le Poer Trench (b 13 October 1799, d 1885), married Thomas Kavanagh "the MacMurrough", a descendant of Art mac Art MacMurrough-Kavanagh
Lady Emily Florinda Le Poer Trench (b 7 November 1800), married Giovanni Cossiria
Lady Frances Power Le Poer Trench (b 22 January 1802, d 28 December 1804)
William Thomas Le Poer Trench, 3rd Earl of Clancarty (b 21 September 1803, d 26 April 1872), married Lady Sarah Juliana Butler, daughter of Somerset Richard Butler, 3rd Earl of Carrick
Honorary Richard John Le Poer Trench (b 1805)
Commander Honorary
Frederick Robert Le Poer Trench (b 23 July 1808, d April 1867), married Catherine Maria Thompson.
1st United Kingdom Parliament. 2nd United Kingdom Parliament. 3rd United Kingdom Parliament.
4th United Kingdom Parliament]
He was an Irish, and later British, Member of Parliament and a supporter of Pitt.