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 by historians as a positive one, and a biography by Tim Pat Coogan alleges that his failures outweigh his achievements, with de Valera's reputation declining while that of his great rival in the 1920s, Michael Collins, is rising.The most recent work on de Valera by historian Diarmaid Ferriter presents a more positive picture of de Valera's legacy. Bertie Ahern, at a book launch for Diarmaid Ferriter's biography of de Valera, described de Valera's achievements in political leadership during the formative years of the state: One of de Valera's finest hours was his regrouping of the Republican side after defeat in