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.
Éamon de Valera or any birth, baptismal, or death certificate information for anyone called Juan Vivion de Valera (nor for "de Valeros", an alternative spelling). On de Valera's original birth certificate, his name is given as George de Valero and his father is listed as Vivion de Valero. Although he was known as Edward de Valera before 1901, a fresh birth certificate was issued in 1910, in which his first name was officially changed to Edward and his father's surname given as "de Valera". As a child, he was known as "Eddie" or "Eddy". According to Coll, Juan Vivion died in 1885 leaving