Patrick Bartholomew "Bertie" Ahern was Ireland's Taoiseach (Prime Minister) from 1997-2008. He led his party, Fianna Fáil, into three successive coalition governments, and was the longest-serving Prime Minister in Irish history. Previously a member of parliament and Mayor of Dublin, Ahern also served as Minister of Labour and Finance before becoming Taoiseach. A significant achievement of Ahern's first term was his part in the negotiation of the Belfast Agreement, commonly called the Good Friday Agreement, in which the British and Irish Governments and most Northern Irish political parties established an "exclusively peaceful and democratic" framework for power-sharing in Northern Ireland. The resultant ceasefire remains in effect to this day. Ahern's background is in accounting, although he was politically active since his youth.