Included are letters from his brother-in-law, General Sir William Howe, about the possibility of a parliamentary attack on Howe for his lack of success in North America. The Lord Lieutenant of Ireland, John Hobart, 2nd Earl of Buckinghamshire, writes on 14 June to ‘My dear brother’ [Hobart married as his second wife on 24 September 1770, Caroline, the daughter of Thomas Conolly's brother William] urging him to attend the Irish House of Commons and support the Roman Catholic Relief Bill. A letter from Edmund Burke, Beaconsfield, 27 August 1778, congratulates Conolly ‘most heartily on the success of the Irish toleration act’. There are also a number of letters about naval affairs, his estate affairs (the correspondents in this instance being George Ash of Ashbrook and John Spotswood, Conolly’s agent at Bellaghy) and horses and hounds. One of Sir William Howe’s letters, dated 12 July 1778 and written from Marble Hill [Twickenham], includes the following: ‘...I am truly yours either in prosperity or adversity...Your attention to me, as mentioned to me by Lady Viscountess Howe, “not to throw myself upon any party for my justification against the attacks of Lord George”, is a mark of the sincerity of your friendship and of your opinion that I am not in need of any additional strength to the facts that I shall produce in the House of Commons when the time comes. I am in an odd state here - most graciously received by the K[ing] and still censured in the Ministerial paper or Morning Post. By your Lord Lieutenant’s [Lord Buckinghamshire] goodness we are most comfortably situated at this place, but ready to quit it on the first intimation of her Ladyship’s return from Ireland. How goes horses and hounds? I hope with the same success as at Almack’s, from whence I hear you waddled off (for it was as much as you could do to walk under the weight) with £8,000, and I hope never to return where you may be subject to the frowns of Madam Fortune, who was so propitious last winter. I find Fanny in charming health, and as partial to the old gentleman [himself] as she was in her younger days…’.