The Treaty of Lisbon is signed by the EU member states to amend both the Treaty of Rome and the Maastricht Treaty which together form the constitutional basis of the EU. The Treaty of Lisbon is effective from 1 December 2009.

Treaty of Lisbon

2007 treaty amending the constitutional basis of the European Union

The Treaty of Lisbon is a European agreement that amends the two treaties which form the constitutional basis of the European Union (EU). The Treaty of Lisbon, which was signed by all EU member states on 13 December 2007, entered into force on 1 December 2009. It amends the…

Member state of the European Union

The European Union (EU) is a political and economic union of 27 member states that are party to the EU's founding treaties, and thereby subject to the privileges and obligations of membership. They have agreed by the treaties to share their own sovereignty through the…

Treaty of Rome

1957 founding treaty of the European Economic Community

The Treaty of Rome, or EEC Treaty, brought about the creation of the European Economic Community (EEC), the best known of the European Communities (EC). The treaty was signed on 25 March 1957 by Belgium, France, Italy, Luxembourg, the Netherlands and West Germany, and it came…

Maastricht Treaty

1992 founding treaty of the European Union

The Treaty on European Union, commonly known as the Maastricht Treaty, is the foundation treaty of the European Union (EU). Concluded in 1992 between the then-twelve member states of the European Communities, it announced "a new stage in the process of European integration"…

December 13

Day of the year

December 13 is the 347th day of the year in the Gregorian calendar; 18 days remain until the end of the year.