Same-sex marriage in Northern Ireland the second attempt to introduce same-sex marriage was defeated by the Northern Ireland Assembly 53-42, with the Democratic Unionist Party and Ulster Unionist Party voting against and Sinn Féin, the Social Democratic and Labour Party, Alliance and the Green Party voting in favour. The third attempt on 29 April 2014 was defeated 51-43, with all nationalist MLAs (Sinn Féin and SDLP), most Alliance MPs and four unionists (two from NI21 and two from UUP) in favour. The remaining unionists (DUP, UUP, UKIP and Traditional Unionist Voice) and two Alliance MLAs voted against. A fourth attempt on 27 April 2015 also
Good Friday Agreement was a large majority in both parts of Ireland in favour of the agreement. In the Republic, 56% of the electorate voted, with 94% of the votes in favour of the amendment to the constitution. The turnout in Northern Ireland was 81%, with 71% of the votes in favour of the agreement. In the Republic, the electorate voted upon the nineteenth amendment to the Constitution of Ireland. This amendment both permitted the state to comply with the Belfast Agreement and provided for the removal of the "territorial claim" contained in Articles 2 and 3. A referendum on the Amsterdam Treaty