Éamon de Valera new line. However, a vote to accept the Free State Constitution (contingent on the abolition of the Oath of Allegiance) narrowly failed. Soon afterward, de Valera resigned from Sinn Féin and seriously considered leaving politics. However, one of his colleagues, Seán Lemass, convinced de Valera to found a new republican party. In March 1926, with Lemass, Constance Markievicz and others, de Valera formed a new party, Fianna Fáil ("The Warriors of Destiny"), a party that was to dominate 20th-century Irish politics. While Sinn Féin still held to an abstentionist line, Fianna Fáil was dedicated to republicanising the Free State from
Éamon de Valera and two daughters: Máirín (1912–84) and Emer (1918–2012). Brian de Valera predeceased his parents. While he was already involved in the Gaelic Revival, de Valera's involvement in the political revolution began on 25 November 1913, when he joined the Irish Volunteers. The organisation was formed to oppose the Ulster Volunteers and ensure the enactment of the Irish Parliamentary Party's Third Home Rule Act won by its leader John Redmond. After the outbreak of World War I in August 1914, de Valera rose through the ranks and it was not long before he was elected captain of the Donnybrook branch. Preparations