Seán Lemass Irish Free State, the legitimacy of the Dáil, and its abstentionist policy of refusing to sit in the Dáil, if elected. However, the effort was unsuccessful and in March 1926, however, de Valera, along with Lemass, resigned from the party. At this point, de Valera contemplated leaving public life, a decision that would have changed the course of Irish history. It was Lemass who encouraged him to stay and form a political party. In May, de Valera, assisted by Gerald Boland and Lemass, began to plan a new party. This new party became known as Fianna Fáil – The Republican
Éamon de Valera the work of Michael Collins and based on three sources: British oaths in the dominions, the oath of the Irish Republican Brotherhood and a draft oath prepared by de Valera in his proposed Treaty alternative, "Document No. 2"). De Valera began a legal case to challenge the requirement that members of his party take the Oath, but the assassination of the Vice-President of the Executive Council (deputy prime minister) Kevin O'Higgins on 10 July 1927 led the Executive Council under W. T. Cosgrave to introduce a Bill on 20 July requiring all Dáil candidates to promise on oath that if