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 rail Chatham rail The Chatham rail ("Cabalus modestus") is an extinct flightless species of bird in the family Rallidae. It was endemic to New Zealand. Genetic similarity with "Gallirallus dieffenbachii" is why many view this species as part of the genus "Gallirallus." "Cabalus modestus" was endemic to Chatham, Mangere and Pitt Islands, New Zealand. It was first discovered on Mangere in 1871, and 26 specimens collected there are known from museum collections. It became extinct on the island between 1896 and 1900. The species is also known from 19th century bones from Chatham and Pitt Islands. It is likely to have