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,
Frederick North, 5th Earl of Guilford Frederick North, 5th Earl of Guilford Frederick North, 5th Earl of Guilford (7 February 1766 – 14 October 1827), styled The Honourable Frederick North until 1817, was a British politician and colonial administrator. North was a younger son of Prime Minister Frederick North, 2nd Earl of Guilford (usually referred to as Lord North). He was educated at Eton College (1775–82) and Christ Church, Oxford. In 1791, he converted to the Eastern Orthodox Church and became an ardent adherent. He was elected a Fellow of the Royal Society in 1794. He represented Banbury in Parliament from 1792 to 1794. He served