Sinn Féin for nine years. (It merged with two other organisations to form Fine Gael in 1933.) Anti-Treaty Sinn Féin members continued to boycott the Dáil. At a special "Ard Fheis" in March 1926, de Valera proposed that elected members be allowed to take their seats in the Dáil if and when the controversial Oath of Allegiance was removed. When his motion was defeated, de Valera resigned from Sinn Féin; on 16 May 1926, he founded his own party, Fianna Fáil, which was dedicated to republicanising the Free State from within its political structures. He took most Sinn Féin TDs with him.
Fianna Éireann Fianna Éireann Na Fianna Éireann (The Fianna of Ireland), known as the Fianna, is an Irish nationalist youth organisation founded by Bulmer Hobson and Constance Markievicz in 1909. Fianna members were involved in the setting up of the armed nationalist body the Irish Volunteers, and had their own circle of the Irish Republican Brotherhood (IRB). They took part in the 1914 Howth gun-running and (as Volunteer members) in the 1916 Easter Rising. They were active in the War of Independence and took the anti-Treaty side in the Civil War. The Fianna were declared an illegal organisation by the government of