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,
Chatham Sound Chatham Sound Chatham Sound is a sound on the North Coast of British Columbia, Canada, bordering on Alaska, United States. It is located between Dundas and Stephens Islands and the Tsimpsean Peninsula near Prince Rupert. It is part of the Inside Passage and extends from Portland Inlet in the north to Porcher Island in the south. It may have been named in 1788 by British Captain Charles Duncan after John Pitt, 2nd Earl of Chatham, who was First Lord of the Admiralty at that time. Chatham Sound is a semi-enclosed basin with an area of about . It is connected