Konstantinos Karamanlis signs the full treaty of the accession of Greece with the European Economic Community.

Konstantinos G. Karamanlis was a Greek statesman who was the four-time Prime Minister of Greece and two-term president of the Third Hellenic Republic, serving in the former role from 1955 to 1963 and from 1974 to 1980. A towering figure of Greek politics, his political career spanned portions of seven decades, covering much of the latter half of the 20th century.

The European Economic Community (EEC) was a regional organisation created by the Treaty of Rome of 1957, aiming to foster economic integration among its member states. It was subsequently renamed the European Community (EC) upon becoming integrated into the first pillar of the newly formed European Union (EU) in 1993. In the popular language, the singular European Community was sometimes inaccurately used in the wider sense of the plural European Communities, in spite of the latter designation covering all the three constituent entities of the first pillar. The EEC was also known as the European Common Market (ECM) in the English-speaking countries, and sometimes referred to as the European Community even before it was officially renamed as such in 1993. In 2009, the EC formally ceased to exist and its institutions were directly absorbed by the EU. This made the Union the formal successor institution of the Community.