Leader of Fianna Fáil Leader of Fianna Fáil The Leader of Fianna Fáil is the most senior politician within the Fianna Fáil political party in Ireland. Since 26 January 2011, the office has been held by Micheál Martin, following the resignation of Taoiseach Brian Cowen as leader of the party. The post of Leader of Fianna Fáil was officially created in 1926 when Éamon de Valera founded the party. De Valera had previously been leader of Sinn Féin and took the Anti-Treaty side during the Civil War. The new party essentially became a home for dissatisfied Sinn Féin TDs who had become disillusioned with
Sinn Féin Sinn Féin Sinn Féin ( ; ; is a left-wing Irish republican political party active in both the Republic of Ireland and Northern Ireland. The original Sinn Féin organisation was founded in 1905 by Arthur Griffith. It took its current form in 1970 after a split within the party (with the other side becoming the Workers' Party of Ireland) and has historically been associated with the Provisional Irish Republican Army (IRA). Mary Lou McDonald has been party president since February 2018. Sinn Féin is the largest nationalist party in the Northern Ireland Assembly, and the joint-largest overall (alongside the Democratic