Treaties of the European Union the Functioning of the European Union (originally signed in Rome in 1957 as the Treaty establishing the European Economic Community, aka The Treaty of Rome), lay out how the EU operates, and there are a number of satellite treaties which are interconnected with them. The treaties have been repeatedly amended by other treaties over the 65 years since they were first signed. The consolidated version of the two core treaties is regularly published by the European Commission. The two principal treaties on which the EU is based are the Treaty on European Union (TEU; Maastricht Treaty, effective since 1993) and
European Economic Community European Parliament, members are allocated a set number seats related to their population, however these (since 1979) have been directly elected and they sit according to political allegiance, not national origin. Most other institutions, including the European Court of Justice, have some form of national division of its members. There were three political institutions which held the executive and legislative power of the EEC, plus one judicial institution and a fifth body created in 1975. These institutions (except for the auditors) were created in 1957 by the EEC but from 1967 onwards they applied to all three Communities. The Council