The office of chief governor of Ireland existed under various names from the 12th-century Norman invasion to the creation of the Irish Free State on 6 December 1922. Common names were (Chief) justiciar (13th–14th centuries); (King's) lieutenant (14th–16th century); (Lord) Deputy (15th–17th centuries), and Lord Lieutenant (standard after 1690). The unofficial term Viceroy was also common. The office was replaced by the Governor-General of the Irish Free State. In Northern Ireland the position was replaced by that of Governor of Northern Ireland.