Treaty on the Functioning of the European Union Treaty on the Functioning of the European Union The Treaty on the Functioning of the European Union (2007) is one of two primary Treaties of the European Union, alongside the Treaty on European Union (TEU). Originating as the Treaty of Rome, the TFEU forms the detailed basis of European Union law, by setting out the scope of the EU's authority to legislate and the principles of law in those areas where EU law operates. The TFEU originated as the treaty establishing the European Economic Community (the EEC treaty), signed in Rome on 25 March 1957. On 7 February 1992, the
Treaty of Rome full name of which was the Treaty establishing the European Economic Community has been amended by successive treaties significantly changing its content. The 1992 Treaty of Maastricht established the European Union, the EEC becoming one of its three pillars, the European Community. Hence, the treaty was renamed the Treaty establishing the European Community (TEC). When the Treaty of Lisbon came into force in 2009, the pillar system was abandoned; hence, the EC ceased to exist as a legal entity separate from the EU. This led to the treaty being amended and renamed as the Treaty on the Functioning of the