The signing of the "Treaty of Lisbon" took place in Lisbon, Portugal on 13 December 2007. This treaty however was designed so it would not be necessary it put it to referendums. However Republic of Ireland was required by its constitution to hold a referendum. In 2008 the referendum was lost, setting back the treaty's implementation. However, after a series of guarantees was given to Ireland, the Irish reversed their decision in a second referendum in 2009.