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,
William Pitt, 1st Earl of Chatham "destroying all party distinctions". Pitt made appointments based not on connections but on merit, such as Charles Townshend to the Exchequer and Shelburne as Secretary of State, to order American affairs. Pitt chose for himself the office of Lord Privy Seal, which required his elevation to the House of Lords, and on 4 August he became Earl of Chatham in the county of Kent and Viscount Pitt of Burton Pinsent in the county of Somerset. Pitt's decision to accept a peerage was likely influenced by his declining health and desire for a less demanding role, but the "great commoner" lost