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
President of the European Commission Functioning of the European Union; a founding treaty of the union, which explains that the enumeration of presidents which ends with the present position starts with the first President of the Commission of the European Economic Community. The European Union is also the legal successor of the European Economic Community, or the European Community as it was named between 1993 and 2009. The establishment of the European Union in 1993 upon the entry into force of the Maastricht Treaty (formally the Treaty on European Union) did not affect the name of the position. Upon its entry into force in 2009,