The treaties constitute the European Union’s ‘primary legislation’, which is comparable to constitutional law at national level. They thus lay down the fundamental features of the Union, in particular the responsibilities of the various actors in the decision-making process, the legislative procedures, under the Community system and the powers conferred on them. The treaties themselves are the subject of direct negotiations between the governments of the Member States, after which they have to be ratified in accordance with the procedures applying at national level (in principle by the national parliaments or by referendum).
Includes Treaty Establishing the European Atomic Energy Community, Treaty establishing the European Coal and Steel Community, Treaty establishing the European Community, and Treaty on European Union.
Treaty establishing the European Coal and Steel Community (1951)
Treaties of Rome (EEC and EURATOM treaties) (1957)
Merger Treaty (Brussels Treaty) (1965)
Single European Act (1986)
Treaty on European Union (Maastricht Treaty) (1992)
Treaty of Amsterdam (1997)
Treaty of Nice (2001)
Treaty of Lisbon (2007)