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 Bellomont died without surviving male issue in 1766. The late Earl was succeeded in the barony of Coote by his first cousin once removed, Charles Coote, who became the fifth Baron. Charles was the son of Charles Coote (1695–1750), Member of Parliament for County Cavan, son of the Honourable Thomas Coote, a Justice of the Court of King's Bench (Ireland), younger son of the first Baron. On 4 September 1767 the earldom of Bellomont was created for the third time when Charles was made Earl of Bellomont (although the title was probably erroneously spelled "Bell"a"mont" in the letters patent). On 18