Dáil Éireann, also called the Revolutionary Dáil, was the revolutionary, unicameral parliament of the Irish Republic from 1919 to 1922. The Dáil was first formed on 21 January 1919 in Dublin by 69 Sinn Féin MPs elected in the 1918 United Kingdom general election, who had won 73 seats of the 105 seats in Ireland, with four party candidates elected for two constituencies. Their manifesto refused to recognise the British parliament at Westminster and instead established an independent legislature in Dublin. The convention of the First Dáil coincided with the beginning of the War of Independence.

The 1918 Irish general election was the part of the 1918 United Kingdom general election which took place in Ireland. It is a key moment in modern Irish history because it saw 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 1917–18. The party had vowed in its manifesto to establish an independent Irish Republic. In Ulster, however, the Unionist Party was the most successful party.