In 1918 the whole of Ireland was a part of the United Kingdom of Great Britain and Ireland and was represented in the British House of Commons by 105 MPs. From 1882–1918 most Irish MPs were members of the Irish Parliamentary Party (IPP) who strove in several Home Rule Bills to achieve self-government for Ireland within the United Kingdom through the constitutional movement for reform. This approach put the Third Home Rule Act 1914 on the statute book but the implementation of this legislation was temporarily postponed with the outbreak of the First World War. In the meantime the more radical Sinn Féin party grew in strength.
Sinn Féin's founder, Arthur Griffith, believed that nationalists should emulate the means by which Hungarian nationalists had achieved partial independence from Austria. In 1867, led by Ferenc Deák, Hungarian representatives had boycotted the Imperial parliament in Vienna and unilaterally established their own legislature in Budapest. The Austrian government had eventually become reconciled to this new state of affairs which became known as an Ausgleich or "compromise". Members of Sinn Féin also, however, supported achieving separation from Britain by means of an armed uprising if necessary.
Between the Easter Rising of 1916 and the 1918 general election, Sinn Féin's popularity was increased dramatically by the execution of most of the leaders of the 1916 rebels, the party's reorganisation in 1917 and by its opposition to military conscription in Ireland (see Conscription Crisis of 1918). The party was also aided by the 1918 Representation of the People Act which increased the Irish electorate from around 700,000 to about two million.
Voting in the 1918 general election occurred in most constituencies on 14 December and elections were held almost entirely under the traditional 'first-past-the-post' system. In total Sinn Féin won 73 out of the 105 Irish seats in the Westminster parliament, their votes 476,087 (or 46,9%) for 48 seats, plus 25 uncontested without a ballot. Unionists (including Unionist Labour) previously 19 won 26 seats on 305,206 (30,2%) votes, all but three of which were in the six counties that today form Northern Ireland, and the IPP won merely six (down from 84 in 1910), all but one in Ulster, on 220,837 (21,7%) votes cast. The Irish Party won a smaller share of seats than votes as the election was not run under a "proportional representation" system. Because of the large number of Sinn Féin candidates elected unopposed, and despite their opponents polling nearly 52% of the votes, the elections were seen as a landslide victory for the party.
Once elected the Sinn Féin MPs chose to follow through with their Manifesto's plan of abstention from the Westminster parliament and instead assembled as a revolutionary parliament they called "Dáil Éireann": the Irish for "Assembly of Ireland". Unionists and members of the IPP refused to recognise the Dáil, and three Sinn Féin candidates had been elected in two different constituencies, so the First Dáil consisted of a total of seventy Deputies or "TDs". Forty-three of these were absent from the inaugural meeting as they were imprisoned or on the run from the British. Six Sinn Féin MPs were elected in the counties that are now Northern Ireland. Of these two also held seats in other parts of the country.
The Declaration of Independence asserted that the Dáil was the parliament of a sovereign state called the "Irish Republic", and so the Dáil established a cabinet called the Ministry or "Aireacht", and an elected a prime minister known both as the "Príomh Aire" and the "President of Dáil Éireann". The first, temporary president was Cathal Brugha. He was succeeded, in April, by Éamon de Valera.
The membership of the Dáil was drawn from the Irish MPs elected to sit at the Westminister parliament, 105 in total, of which 27 were present as being present (i láthair) for the first meeting. Of the remainder 35 were described as being "imprisoned by the foreign enemy" (fé ghlas ag Gallaibh) and 4 as being "deported by the foreign enemy" (ar díbirt ag Gallaibh). Two names are left unstated as to their attendance or otherwise. The remaining 37 members not present were drawn mainly from the northern six counties that would later form Northern Ireland. There included all MPs elected to sit for Belfast city, Counties Londonderry, Down, Antrim, Armagh, and Fermanagh, and two out of three MPs for County Tyrone. For the portion of the country that would later become the Irish Free State, MPs did not sit for Waterford city or the Dublin University constituency (although members did attend for the National University of Ireland constituency). In other places, attendance was not universal:
In September 1919 the Dáil was declared illegal by the British authorities and thereafter met only intermittently and at various locations. The First Dáil held its last meeting on 10 May 1921. After elections on 24 May the Dáil was succeeded by the Second Dáil which sat for the first time on 16 August.
Today the name Dáil Éireann is used for the lower house of the modern Oireachtas (parliament) of the Republic of Ireland. Many commentators, including, recently, Taoiseach Bertie Ahern, have suggested that despite the ambitious aspirations of the First Dáil, Irish independence only "really" began in 1922 with the foundation of the Irish Free State. Nonetheless, successive Dála (plural for Dáil) continue to be numbered from the "First Dáil" convened in 1919. The current Dáil, elected in 2007, is as a result, the "30th Dáil".
Seán MacEntee, who died on January 10, 1984 at the age of 94, was the last surviving member of the First Dáil.