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,
Earl of Godolphin Marlborough. Their only son, William Godolphin, Marquess of Blandford, was childless and predeceased both his parents. In 1735 the 2nd Earl was created Baron Godolphin, of Helston, in the Peerage of Great Britain, with remainder, in default of male issue of his own, to the male issue of his deceased uncle Henry Godolphin, Dean of St Paul's. When the 2nd Earl died in 1766, the Godolphin earldom, the Rialton viscounty, and the Godolphin barony of 1684 became extinct; but the Godolphin barony of 1735 devolved upon his cousin Francis Godolphin, 2nd Baron Godolphin. The ancestral seat of the Godolphin family