Patrick Bartholomew "Bertie" Ahern (born 12 September 1951) is a former Irish Fianna Fáil politician who served as Taoiseach (Gaelic for Prime minister) of Ireland from 26 June 1997 to 7 May 2008. Bertie Ahern's term as Taoiseach is the longest. Ahern resigned as Taoiseach on 6 May 2008, in the wake of revelations made in Mahon Tribunal. The Mahon investigated allegations of corruption and financial rewards for contracts.

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