Earl of Londonderry extinct on the death of his great-grandson, the fourth Earl, in 1714. The second creation came in 1726 in favour of the soldier and politician Thomas Pitt, 1st Baron Londonderry. He had already been created Baron Londonderry in 1719 and was made Viscount Gallen-Ridgeway at the same time as he was granted the earldom, also in the Peerage of Ireland. He was the husband of Lady Frances Ridgeway, daughter and heiress of the fourth Earl of the first creation. A member of the prominent Pitt family, he was the uncle of William Pitt, 1st Earl of Chatham. His younger son,
Thomas Egerton, 1st Earl of Wilton Thomas Egerton, 1st Earl of Wilton Thomas Grey Egerton, 1st Earl of Wilton (14 August 1749 – 23 September 1814), known as Sir Thomas Grey Egerton, Bt from 1766 to 1784, was a British politician who sat in the House of Commons from 1772 to 1784 when he was raised to the peerage as Baron Grey de Wilton. Egerton was the son of Sir Thomas Grey Egerton, 6th Baronet, of the Egerton family, and his wife Catherine Copley, daughter of Rev. John Copley of Batley, Yorkshire. He was educated at Westminster School in 1764. In 1766 he succeeded his father