December 6, 1921

The Anglo-Irish Treaty was signed, ending the Irish War of Independence and establishing the Irish Free State as a self-governing dominion within the British Empire.


London, United Kingdom | British Government

Watercolor painting based depiction of The Anglo-Irish Treaty was signed, ending the Irish War of Independence and establishing the Irish Free State as a self-governing dominion within the British Empire. (1921)

The Signing of the Anglo-Irish Treaty

Date: December 6, 1921

Context and Background

The signing of the Anglo-Irish Treaty on December 6, 1921, marked a pivotal moment in Irish history, bringing an end to the Irish War of Independence. This conflict, which lasted from 1919 to 1921, was a guerrilla war between the Irish Republican Army (IRA) and British forces. The war was rooted in Ireland’s long-standing struggle for independence from British rule, which intensified following the 1916 Easter Rising and the subsequent rise of Sinn Féin, a political party advocating for Irish independence.

Key Events Leading to the Treaty

  • 1918 General Election: Sinn Féin won a landslide victory in Ireland, leading to the establishment of the First Dáil (Irish Parliament) and a declaration of independence from Britain.
  • Irish War of Independence: The conflict began in January 1919, characterized by ambushes, assassinations, and reprisals, with the IRA employing guerrilla tactics against British forces.
  • Truce of July 1921: After years of violence and mounting pressure, both sides agreed to a truce in July 1921, paving the way for negotiations.

The Negotiations

Negotiations took place in London between representatives of the British government and the Irish delegation. The British delegation was led by Prime Minister David Lloyd George, while the Irish delegation included key figures such as Arthur Griffith and Michael Collins. The talks were complex and fraught with tension, as both sides had to navigate contentious issues such as the status of Northern Ireland and the nature of Irish sovereignty.

Terms of the Treaty

The Anglo-Irish Treaty established the Irish Free State as a self-governing dominion within the British Empire, similar to Canada or Australia. Key provisions included:

  • Dominion Status: The Irish Free State would have its own parliament and executive, with the British monarch as the head of state, represented by a Governor-General.
  • Oath of Allegiance: Members of the Irish parliament were required to swear an oath of allegiance to the British monarch.
  • Northern Ireland: The treaty allowed Northern Ireland to opt out of the Free State and remain part of the United Kingdom, which it did.

Aftermath and Consequences

The signing of the treaty was met with mixed reactions in Ireland. It was seen as a compromise that fell short of full independence, leading to a split within the Irish nationalist movement:

  • Pro-Treaty and Anti-Treaty Factions: The division led to the Irish Civil War (1922-1923) between pro-treaty forces, who supported the agreement as a stepping stone to full independence, and anti-treaty forces, who viewed it as a betrayal.
  • Establishment of the Irish Free State: Despite the civil war, the Irish Free State was formally established in December 1922, laying the groundwork for the Republic of Ireland, which would eventually be declared in 1949.

Historical Significance

The Anglo-Irish Treaty was a landmark in the history of Ireland and the British Empire. It marked the beginning of the end of British rule in most of Ireland and set the stage for the eventual establishment of a fully independent Irish republic. The treaty’s legacy is complex, as it both resolved and sowed new conflicts, shaping the political landscape of Ireland for decades to come.