W. T. Cosgrave

William Thomas Cosgrave (6 June 1880 – 16 November 1965) was an Irish Fine Gael politician. He was President of the Executive Council from 1922 to 1932 and Leader of the Opposition from 1932 to 1944.
Cosgrave was Leader of Fine Gael from 1934 to 1944, Leader of Cumann na nGaedheal from 1923 to 1933, Chairman of the Provisional Government from August 1922 to December 1922, President of Dáil Éireann from September 1922 to December 1922, Minister for Finance from 1922 to 1923 and Minister for Local Government from 1919 to 1922. 
He was a Teachta Dála (TD) from 1921 to 1944. 
He was a Member of Parliament (MP) for the North Kilkenny constituency from 1918 to 1922.
Cosgrave never officially held the office of Taoiseach.