In 1729 William Conolly inherited the estates of his uncle, Thomas Conolly, Speaker of the Irish House of Commons, reported to be the richest man in Ireland. In 1733 he married the daughter of Lord Strafford, on whose interest he was returned for Aldeburgh in 1734, though Strafford was a Tory, while Conolly describes himself in a letter to his father-in-law as ‘an incorrigible Whig’, adding:
Neither the outcry against the excise, standing army etc., could change my thought, without the hope of place or pension, which is attributed to be the only excuse of people’s steadiness at present.22 May 1734, Add. 22228, f. 122.
Voting consistently with the Government, he was classed in 1746 as Old Whig. He decided not to stand for Aldeburgh in 1747,3Pelham to Bedford, 28 Dec. 1746, Bedford mss. when he was returned for Petersfield. He died 2 Jan. 1754, ‘possessed of an estate of £15,000 p.a.’4Gent. Mag. 1754, p. 47.