Éamon de Valera Irish independence. He was arrested, sentenced to death but released for a variety of reasons, including the public response to the British execution of Rising leaders. He returned to Ireland after being jailed in England and became one of the leading political figures of the War of Independence. After the signing of the Anglo-Irish Treaty, de Valera served as the political leader of Anti-Treaty Sinn Fein until 1926, when he, along with many supporters, left the party to set up Fianna Fáil, a new political party which abandoned the policy of abstentionism from Dáil Éireann. From there, de Valera would
Fianna Fáil other members split from Sinn Féin when a motion he proposed—which called for elected members to be allowed to take their seats in Dáil Éireann if and when the controversial Oath of Allegiance was removed—failed to pass at the Sinn Féin Ard Fheis in 1926. The party adopted its name on 2 April of the same year. While Fianna Fáil was also opposed to the Treaty settlement, it rejected abstentionism, instead aiming to republicanise the Irish Free State from within. The party's platform of economic autarky had appeal among the farmers, working-class people and the poor while alienating more affluent