Taoiseach 1937–48
Fianna Fáil having won the election held the same day as the plebiscite that ratified the constitution, de Valera continued as President of the Executive Council until 29 December 1937, when the new constitution was enacted and his office automatically became that of Taoiseach—a position with considerably more power, including the authority to dismiss ministers individually and to request a dissolution of the Dáil.
Read more about this topic: Éamon De Valera