Cumann na Poblachta was an Irish republican

Irish Republicanism

Irish republicanism is an ideology based on the belief that all of Ireland should be an independent republic.In 1801, under the Act of Union, the Kingdom of Great Britain and the Kingdom of Ireland merged to form the United Kingdom of Great Britain and Ireland...

 political party.

The party was founded on 15 March 1922 by Éamon de Valera

Éamon de Valera

Éamon de Valera was one of the dominant political figures in twentieth century Ireland, serving as head of government of the Irish Free State and head of government and head of state of Ireland...

. It opposed the Anglo-Irish Treaty

Anglo-Irish Treaty

The Anglo-Irish Treaty , officially called the Articles of Agreement for a Treaty Between Great Britain and Ireland, was a treaty between the Government of the United Kingdom of Great Britain and Ireland and representatives of the secessionist Irish Republic that concluded the Irish War of...

 and was composed of the anti-Treaty wing of Sinn Féin. The party did contest the 1922 Irish general election

Irish general election, 1922

The Irish general election of 1922 took place in Southern Ireland on 16 June 1922, under the provisions of the 1921 Anglo-Irish Treaty to elect a constituent assembly paving the way for the formal establishment of the Irish Free State...

 but, in accordance with the Collins

Michael Collins (Irish leader)

Michael "Mick" Collins was an Irish revolutionary leader, Minister for Finance and Teachta Dála for Cork South in the First Dáil of 1919, Director of Intelligence for the IRA, and member of the Irish delegation during the Anglo-Irish Treaty negotiations. Subsequently, he was both Chairman of the...

/De Valera Pact, under the Sinn Féin

Sinn Féin

Sinn Féin is a left wing, Irish republican political party in Ireland. The name is Irish for "ourselves" or "we ourselves", although it is frequently mistranslated as "ourselves alone". Originating in the Sinn Féin organisation founded in 1905 by Arthur Griffith, it took its current form in 1970...

 banner like their opponents.

The party commonly appended the title The Republican Party to its name. This subtitle was later adopted by the Fianna Fáil

Fianna Fáil

Fianna Fáil – The Republican Party , more commonly known as Fianna Fáil is a centrist political party in the Republic of Ireland, founded on 23 March 1926. Fianna Fáil's name is traditionally translated into English as Soldiers of Destiny, although a more accurate rendition would be Warriors of Fál...

 party at its foundation in 1926.

In 1923, after the pro-Treaty wing of Sinn Féin renamed itself as Cumann na nGaedheal, Cumann na Poblachta continued to use the Sinn Féin name.