Viscount Gage, of Castle Island in the County of Kerry of the Kingdom of Ireland, is a title in the Peerage of Ireland. It was created in 1720 for Thomas Gage, along with the subsidiary title of Baron Gage, of Castlebar in the County of Mayo, also in the Peerage of Ireland. In 1744 he also succeeded his cousin as eighth Baronet, of Firle Place. The titles remain united. The Gage family descends from John Gage, who was created a baronet, of Firle Place in the County of Sussex, in the Baronetage of England on 26 March 1622. His great-grandson, the seventh Baronet, represented Seaford in Parliament. He was succeeded by his first cousin, Thomas Gage, 1st Viscount Gage, the eighth Baronet. He sat as a Member of Parliament for Minehead and Tewkesbury and also served as Governor of Barbados. In 1720, 24 years before succeeding in the baronetcy, he was raised to the Peerage of Ireland as Baron Gage and Viscount Gage. His second son was the military commander the Hon. Thomas Gage.