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.
Sinéad de Valera Sinéad de Valera Sinéad de Valera (née Ní Fhlannagáin; 3 June 1878 – 7 January 1975) was the wife of Taoiseach and the 3rd President of Ireland, Éamon de Valera. She was also the author of a number of children's books in English and Irish. She was born Jane O'Flanagan in Balbriggan. Her father, Laurence, was a carpenter and was a native of Kildare who moved to Balbriggan and married a local girl, Margaret Byrne. The couple emigrated to New York City where their daughter, Mary, was born in 1871. The family had returned to Balbriggan in 1873, and Sinéad