Annesley was born in Dublin, probably in 1645, as he was 16 when he matriculated at Oxford in December 1661. By this date his father was a prominent politician having played a significant role in the restoration of Charles II, for which he received an English earldom. Annesley’s initial public role seems to have been in Ireland, where for a few months in 1666, before its prorogation, he sat as member for Waterford in the only Irish Restoration parliament. At some point around this date he received a commission in the Irish army ‘by resignation of his father,’ which had been disposed of by 1672. In 1667 he was undertaking commissions for his father in Ireland.
After several vain attempts to find a seat in the Cavalier Parliament, including the possibility of standing for Leicester and Radnorshire in 1677, Annesley was returned to the Exclusion Parliaments for Winchester.
Following his father’s death in April 1686, Anglesey was introduced in the Lords at the prorogation on 10 May 1686. In July 1687 Anglesey’s house at Farnborough was destroyed by fire.
Anglesey was absent from the beginning of the Convention, and was excused attendance for sickness on 25 Jan. 1689 (he seems to have inherited his father’s affliction of the gout). He first attended the Lords on 4 Feb., whereupon he was appointed one of the managers of a conference with the Commons to discuss the wording of the bill formally establishing the reign of William and Mary. The Lords could not agree with the wording proposed by the Commons and Anglesey voted against using the word ‘abdicated’ rather than ‘deserted’ with reference to James II’s actions. On 5 Feb. the same managers were appointed to the conference when the Lords set out the reasons why they could not agree with the Commons. Crucially, he stayed away from the Lords on 6 Feb. and was listed as absent when the Lords voted to agree with the Commons that the king had ‘abdicated’ and that the throne was therefore ‘vacant.’ He took the oaths on 5 March.
On 15 Apr. 1689 Anglesey was ordered to attend the Lords the following day in order to hear the petition of his wife concerning the non-payment of a rent charge to her on lands at Bletchingdon. The question of whether she had breached the earl’s privilege in writing to one of the tenants concerning these rentals was referred to the committee of privileges on 16 April. The report from the committee on 18 Apr. left the issue of privilege to the House itself, which opted to appoint a group of peers to mediate between Anglesey and his wife. He again received leave of absence for ill health on 22 May, having only attended on one occasion between 18 Apr. and 29 July. On 30 July Anglesey voted to agree with the Lords proposal to reverse the judgments of perjury against Titus Oates. In total, he attended on 27 days of the session, 17 per cent of sittings of the House, and was named to three committees. Neither Anglesey, nor his brother, Altham Annesley, Viscount Altham [I], attended James II’s Irish parliament in May 1689.
Reckoned an opponent of the court in a list drawn up by Thomas Osborne, marquess of Carmarthen, between October 1689 and February 1690, in the second session of the Convention Anglesey attended on 12 occasions, 16 per cent of the sittings, and was named to three committees. Anglesey was absent from the opening session of the 1690 Parliament and was excused attendance on grounds of ill health on 31 March. He died the following day on 1 Apr. 1690, reportedly of an apoplexy.
