President of the Republic was the title given to the head of the Irish ministry or Aireacht

Aireacht

The Aireacht or Ministry was the cabinet of the 1919–1922 Irish Republic. The Ministry was originally established by the Dáil Constitution adopted by the First Dáil in 1919, after it issued the Irish Declaration of Independence...

 in August 1921 by an amendment to the Dáil Constitution

Dáil Constitution

The Constitution of Dáil Éireann , more commonly known as the Dáil Constitution, was the constitution of the 1919–22 Irish Republic. It was adopted by the First Dáil at its first meeting on 21 January 1919 and theoretically remained in force for four years. As adopted it consisted of only five...

, which replaced the previous title, Príomh Aire

President of Dáil Éireann

The President of Dáil Éireann was the leader of the revolutionary Irish Republic of 1919–1921. The office, also known as Príomh Aire , was created in the Dáil Constitution adopted by Dáil Éireann, the parliament of the Republic, at its first meeting in January 1919. This provided that the...

 or President of Dáil Éireann

President of Dáil Éireann

The President of Dáil Éireann was the leader of the revolutionary Irish Republic of 1919–1921. The office, also known as Príomh Aire , was created in the Dáil Constitution adopted by Dáil Éireann, the parliament of the Republic, at its first meeting in January 1919. This provided that the...

. Unlike the previous offices, which were simply head of government or prime minister, the President of the Republic was explicitly declared to be the Irish Republic

Irish Republic

The Irish Republic was a revolutionary state that declared its independence from Great Britain in January 1919. It established a legislature , a government , a court system and a police force...

's head of state.

Presidents of the Republic

• Éamon de Valera
  Éamon de Valera
  Éamon de Valera was one of the dominant political figures in twentieth century Ireland, serving as head of government of the Irish Free State and head of government and head of state of Ireland...
  
   – Sinn Féin
  Sinn Féin
  Sinn Féin is a left wing, Irish republican political party in Ireland. The name is Irish for "ourselves" or "we ourselves", although it is frequently mistranslated as "ourselves alone". Originating in the Sinn Féin organisation founded in 1905 by Arthur Griffith, it took its current form in 1970...
  
   (August 1921 to January 1922)

• Arthur Griffith
  Arthur Griffith
  Arthur Griffith was the founder and third leader of Sinn Féin. He served as President of Dáil Éireann from January to August 1922, and was head of the Irish delegation at the negotiations in London that produced the Anglo-Irish Treaty of 1921.-Early life:...
  
   – Pro-Treaty Sinn Féin (January to August 1922)

  Following de Valera's resignation, Arthur Griffith

  Arthur Griffith

  Arthur Griffith was the founder and third leader of Sinn Féin. He served as President of Dáil Éireann from January to August 1922, and was head of the Irish delegation at the negotiations in London that produced the Anglo-Irish Treaty of 1921.-Early life:...

  
   was elected to his office, but though he preferred to use the earlier title of President of Dáil Éireann

  President of Dáil Éireann

  The President of Dáil Éireann was the leader of the revolutionary Irish Republic of 1919–1921. The office, also known as Príomh Aire , was created in the Dáil Constitution adopted by Dáil Éireann, the parliament of the Republic, at its first meeting in January 1919. This provided that the...

  
   he never actually reverted the constitutional amendments of August 1921. Meanwhile Michael Collins

  Michael Collins (Irish leader)

  Michael "Mick" Collins was an Irish revolutionary leader, Minister for Finance and Teachta Dála for Cork South in the First Dáil of 1919, Director of Intelligence for the IRA, and member of the Irish delegation during the Anglo-Irish Treaty negotiations. Subsequently, he was both Chairman of the...

  
   became Chairman of the Provisional Government

  Chairman of the Provisional Government of Southern Ireland

  The Chairman of the Provisional Government of Southern Ireland was a transitional post established in January 1922, lasting until the creation of the Irish Free State in December 1922 in the Provisional Government of Southern Ireland....

  
   of the provisional state created in the 1921 Anglo-Irish Treaty

  Anglo-Irish Treaty

  The Anglo-Irish Treaty , officially called the Articles of Agreement for a Treaty Between Great Britain and Ireland, was a treaty between the Government of the United Kingdom of Great Britain and Ireland and representatives of the secessionist Irish Republic that concluded the Irish War of...

  
  .

• W. T. Cosgrave – Pro-Treaty Sinn Féin (August to December 1922)

  Following Arthur Griffith's death and Michael Collins's assassination in August 1922, Cosgrave simultaneously held both their offices; like Griffith he used the title "President of Dáil Éireann". In reality all distinction between both offices and indeed both states ceased to exist – by September 1922 it was not even clear when TDs assembled whether they were meeting as the Dáil or the Provisional Parliament of the treaty state. Both states themselves and their respective heads of government disappeared with the coming into force in December 1922 of the Constitution of the Irish Free State

  Constitution of the Irish Free State

  The Constitution of the Irish Free State was the first constitution of the independent Irish state. It was enacted with the adoption of the Constitution of the Irish Free State Act 1922, of which it formed a part...

  
  .