Lisbon decisions of the constitutional courts in Austria, the Czech Republic, France, Germany, Hungary, Latvia and Poland from a comparative perspective – Democracy, sovereignty and identity – Permeability of national and supranational law – Ratification of the Lisbon Treaty and its constitutional foundations – Procedural background and legal outcome of the Lisbon decisions – Differences of institutional self-conception – Parliamentary responsibility for integration – Prior parliamentary assent to the future application of ‘dynamic treaty provisions’ – Different conceptions of national and multi-levelled democracy – Popular vote – Constitutional limits to European integration – Limits indicating the necessity of an amendment and limits protecting the inalienable substantial core of a constitutional order – German Bundesverfassungsgericht only court in Europe spelling out an eternity clause in a detailed, catalogue style manner – Judicial restraint – Ultra vires and identity review – Article 4.2 TEU as an integration clause of EU law and not a derogation clause – Comparative dialectics