Caulfeild was a younger son of the distinguished Irish patriot leader Lord Charlemont, whose second son James Thomas died in 1793.
He continued to vote in sporadic bursts with opposition, particularly in its campaign for economies and retrenchment early that decade. He divided for restoring Queen Caroline’s name to the liturgy, 13 Feb., and inquiries into the conduct of the sheriffs of Cheshire, 20 Feb., and Dublin, 22 Feb. 1821. On 14 Mar. 1821 he was again given a month’s leave, this time on account of illness in his family. He voted for more extensive tax reductions to relieve distress, 21 Feb., and to make it a breach of privilege to interfere with Members’ mail, 25 Feb. 1822. The death of Charlemont’s sole surviving son in January 1823 made Caulfeild the heir presumptive to the earldom. He divided for parliamentary reform, 20 Feb., 24 Apr. He voted for inquiries into the Irish church establishment, 4 Mar., the legal proceedings against the Dublin Orange rioters, 22 Apr., and the state of Ireland prior to the introduction of the insurrection bill, 12 May 1823. He again divided for inquiry into the state of Ireland, 11 May, and to abolish Irish pluralities, 27 May 1824. He voted against the Irish unlawful societies bill, 15, 18, 21, 25 Feb., and (as he had on 28 Feb. 1821) for Catholic relief, 1 Mar., 21 Apr., 10 May 1825. He divided to reform the representation of Edinburgh, 13 Apr., and for revision of the corn laws, 18 Apr. 1826.
Certain of his return, Caulfeild ‘professed neutrality’ during the county Armagh contest at the general election of 1826 between his colleague Charles Brownlow, who now favoured Catholic relief, and the Orange challenger, William Verner†. Yet on the hustings, where he was proposed as an ‘independent character and firm patriot’, he expressed support for Brownlow, with whom he was elected.
Despite a promise from Edward Smith Stanley*, the Irish secretary in Lord Grey’s administration, Caulfeild did not receive a coronation peerage in September 1831, and Charlemont, who had long expected a British peerage from the Whigs, had to be mollified by being made a knight of St. Patrick.
