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
High Authority of the European Coal and Steel Community reached. Future executives, the Commissions of the EEC and Euratom, would eventually be based in Brussels. High Authority of the European Coal and Steel Community The High Authority was the executive branch of the former European Coal and Steel Community (ECSC). It was created in 1951 and disbanded in 1967 when it was merged into the European Commission. The High Authority was at the core of the idea of the ECSC. It was to be an independent, supranational executive checked by a Common Assembly. There were concerns about this power, leading to a Council (of governments) and Parliament (of MPs)