Events relating to ireland
John Alcock and Arthur Whitten Brown fly from St John's in Newfoundland to Clifden in Ireland
The Government of Ireland Act provides for separate devolved parliaments in southern Ireland and the six counties of Ulster
The brutal behaviour of the British police reinforcements, the Black and Tans, aggravates the violence in Ireland
The IRA and the British security forces clash during a violent 'Bloody Sunday' in Dublin
James Craig succeeds Edward Carson as leader of the Ulster Unionist party in northern Ireland
The Lord Lieutenant of Ireland appoints James Craig the first prime minister of the new Northern Ireland Parliament
The Parliament of Northern Ireland convenes for the first time
The republican party Sinn Fein is unopposed in southern Ireland's first general election, and so wins every available seat in the Dail
The Sinn Fein members of southern Ireland's new parliament assemble on their own, under the name Dáil Eireann (Assembly of Ireland)
James Craig (later Lord Craigavon) begins a 19-year term as prime minister of the new province of Northern Ireland
Envoys sent to London by de Valera agree independence for southern Ireland as the Irish Free State, with Dominion status
The Anglo-Irish Treaty, agreed in London, ends the war between the British army and the IRA

The British parliament ratifies the Anglo-Irish treaty, but de Valera repudiates it and resigns as president of the Dáil
James Joyce's novel Ulysses is published in Paris, by Sylvia Beach, because of censorship problems elsewhere
In elections to the Dáil the pro-treaty faction of Collins and Griffith defeats the opposition, led by de Valera
Bitter war breaks out between factions of the IRA supporting and opposing the Anglo-Irish Treaty
The Irish Free State takes stringent measures against rebel terrorism, making possession even of a pistol a capital offence

After Michael Collins is killed in an ambush, William Cosgrave and Kevin O'Higgins emerge as leaders of the Irish Free State
Erskine Childers is sent before a firing squad in the Irish Free State for possession of a revolver
With the ratification of the Anglo-Irish Treaty, the 26 counties of southern Ireland formally become the Irish Free State
William Thomas Cosgrave becomes the first prime minister of the Irish Free State
De Valera and the IRA lay down their arms, bringing to an end the Irish civil war
De Valera and his followers do well in elections to the Dáil but decline to take their seats
Sean O'Casey's first play The Shadow of a Gunman is performed at the Abbey Theatre in Dublin
Sean O'Casey's second play Juno and the Paycock is performed at the Abbey Theatre in Dublin