Éamon de Valera among the electorate, 75-year-old de Valera had begun to be seen by the electorate as too old and out of touch to remain as head of government. At the urging of party officials, de Valera decided to retire from government and the Dáil and instead seek the presidency of Ireland. He won the 1959 presidential election on 17 June 1959 and resigned as Taoiseach, Leader of Fianna Fáil and a TD for Clare, six days later, handing over power to Seán Lemass. De Valera was inaugurated President of Ireland on 25 June 1959. He was re-elected President in 1966, aged
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