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 Mount Cashell Earl Mount Cashell Earl Mount Cashell, of Cashell, County Tipperary, was a title in the Peerage of Ireland. It was created in 1781 for Stephen Moore, 2nd Viscount Mount Cashell, who had previously represented Lismore in the Irish House of Commons. He was the eldest surviving son of Stephen Moore, member of the Irish Parliament for County Tipperary, who had been created Baron Kilworth, of Moore Park in the County of Cork, in 1764 and Viscount Mount Cashell, of the City of Cashell, in 1766. These titles were also in the Peerage of Ireland. The first Earl was succeeded by