Irish head of state from 1922 to 1949
The state known today as Ireland is the successor state to the Irish Free State, which existed from December 1922 to December 1937. At its foundation, the Irish Free State was, in accordance with its constitution and the terms of the Anglo-Irish Treaty, governed as a constitutional monarchy and British dominion with the British monarch as head of state.
Source: Wikipedia — Irish head of state from 1922 to 1949 (CC BY-SA 4.0)