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The Merger Treaty, also known as the Treaty of Brussels[1], was a European treaty that unified the executive institutions of the European Coal and Steel Community (ECSC), Atomic Energy Community (Euratom) and the Economic Community (EEC). The treaty was signed in Brussels on 8 April 1965 and came into force on 1 July 1967. It set out that the Commission of the EEC and the Council of the EEC should replace the Commission and Council of Euratom and the High Authority and Council of the ECSC. Although each Community remained legally independent, they shared common institutions (prior to this treaty, they already shared a Parliamentary Assembly and Court of Justice) and were together known as the European Communities. This treaty is regarded by some as the real beginning of the modern European Union.

Merger Treaty
Treaty establishing a Single Council and a Single Commission of the European Communities
TypeMerging the judicial, legislative and administrative bodies of the three European Communities;
and amending the three community treaties accordingly
Signed8 April 1965
LocationBrussels, Belgium
Effective1 July 1967
Expiration1 May 1999 (Amsterdam Treaty)
DepositaryGovernment of Italy
CitationsSubsequent amendment treaty: Single European Act (1986)
LanguagesDutch, French, German and Italian
Merger Treaty at Wikisource

This treaty was abrogated by the Amsterdam Treaty signed in 1997:

Without prejudice to the paragraphs following hereinafter, which have as their purpose to retain the essential elements of their provisions, the Convention of 25 March 1957 on certain institutions common to the European Communities and the Treaty of 8 April 1965 establishing a Single Council and a Single Commission of the European Communities, but with the exception of the Protocol referred to in paragraph 5, shall be repealed.

— Article 9(1) of the Amsterdam Treaty

Structural evolution of the European CommissionEdit

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