Irish Declaration of Independence in the context of "Dáil Éireann (Irish Republic)"

The Irish Republic (Irish: Poblacht na hÉireann or Saorstát Éireann) was a revolutionary state that declared its independence from the United Kingdom of Great Britain and Ireland in January 1919. The Republic claimed jurisdiction over the whole island of Ireland, but by 1920 its functional control was limited to only 21 of Ireland's 32 counties, and British state forces maintained a presence across much of the north-east, as well as Cork, Dublin and other major towns. The republic was strongest in rural areas, and through its military forces was able to influence the population in urban areas that it did not directly control.

Its origins date back to the Easter Rising of 1916, when Irish republicans seized key locations in Dublin and proclaimed an Irish Republic. The rebellion was crushed, but the survivors united under a reformed Sinn Féin party to campaign for a republic. In the 1918 United Kingdom general election, the party won a clear majority of the constituencies in Ireland; in many seats Sinn Féin candidates did not face meaningful opposition. The Sinn Féin winners did not take their seats in the U.K. parliament, but instead gathered in Dublin on 21 January 1919 to form the first Dáil (legislature) of Ireland. Republicans then established a government, a court system and a police force. At the same time, the Irish Volunteers, who came under the control of the Dáil and became known as the Irish Republican Army, fought against British state forces in the Irish War of Independence.

The First Dáil (Irish: An Chéad Dáil) was Dáil Éireann as it convened from 1919 to 1921. It was the first meeting of the unicameral parliament of the revolutionary Irish Republic. In the December 1918 election to the Parliament of the United Kingdom, the Irish republican party Sinn Féin won a landslide victory in Ireland. In line with their manifesto, its MPs refused to take their seats, and on 21 January 1919 they founded a separate parliament in Dublin called Dáil Éireann ("Assembly of Ireland"). They declared Irish independence, ratifying the Proclamation of the Irish Republic that had been issued in the 1916 Easter Rising, and adopted a provisional constitution.

Its first meeting happened on the same day as one of the first engagements of what became the Irish War of Independence. Although the Dáil had not authorised any armed action, it became a "symbol of popular resistance and a source of legitimacy for fighting men in the guerrilla war that developed".

The Irish component of the 1918 United Kingdom general election took place on 14 December 1918. It was the final United Kingdom general election to be held throughout Ireland, as the next election would happen following Irish independence. It is a key moment in modern Irish history, seeing the overwhelming defeat of the moderate nationalist Irish Parliamentary Party (IPP), which had dominated the Irish political landscape since the 1880s, and a landslide victory for the radical Sinn Féin party. Sinn Féin had never previously stood in a general election, but had won six seats in by-elections in 1917–1918. The party had vowed in its manifesto to establish an independent Irish Republic. In Ulster, however, the Unionist Party was the most successful party.

In the aftermath of the elections, Sinn Féin's elected members refused to attend the British Parliament in Westminster (London), and instead formed a parliament in Dublin, the First Dáil Éireann ("Assembly of Ireland"), which declared Irish independence as a republic. The Irish War of Independence was conducted under this revolutionary government which sought international recognition, and set about the process of state-building. The other parties elected in the election were invited by Sinn Féin to join in creating the Dáil Éireann, but declined and took up their seats at Westminster.

The Soloheadbeg ambush took place on 21 January 1919, when members of the Irish Volunteers (or Irish Republican Army [IRA]) ambushed Royal Irish Constabulary (RIC) officers who were escorting a consignment of gelignite explosives at Soloheadbeg, County Tipperary. Two RIC officers were killed and their weapons and the explosives were stolen. The Volunteers acted on their own initiative and had not sought authorisation for their action. As it happened on the same day that the revolutionary Irish parliament first met and declared Ireland's independence, it is often seen as the first engagement of the Irish War of Independence.

The president of Dáil Éireann (Irish: Príomh aire [ˌpʲɾʲiːw ˈaɾʲə]), later also president of the Irish Republic, was the leader of the revolutionary Irish Republic of 1919–1922. The office 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 president was elected by the Dáil as head of a cabinet called the Ministry of Dáil Éireann. During this period, Ireland was deemed by Britain to be part of the United Kingdom of Great Britain and Ireland, but the Irish Republic had made a unilateral Declaration of Independence on 21 January 1919. On 6 December 1922, after the ratification of the Anglo-Irish Treaty, the Irish Free State was recognised by Britain as a sovereign state, and the position of the president of Dáil Éireann was replaced by that of president of the Executive Council of the Irish Free State but, as a Dominion of the British Empire, the British monarch was head of state until the dominion status was rescinded in 1949.