Following his signing of the Accession Treaty with the European Economic Community (now the European Union) in 1979, Karamanlis relinquished the Premiership and was elected President of the Republic in 1980 by the Parliament, and in 1981 he oversaw Greece's formal entry into the European Economic Community as its tenth member.
He served until 1985 then resigned and was succeeded by Christos Sartzetakis.
It is famous his phrase during the 1989 political crisis and the political polarisation of the era: "Hellas has been transformed to an endless bedlam."

In 1990 he was re-elected President by a conservative parliamentary majority (under the conservative government of then Prime Minister Konstantinos Mitsotakis) and served until 1995, when he was succeeded by Kostis Stephanopoulos.
Following his signing of the Accession Treaty with the European Economic Community (now the European Union) in 1979, Karamanlis relinquished the Premiership and was elected President of the Republic in 1980 by the Parliament, and in 1981 he oversaw Greece's formal entry into the European Economic Community as its tenth member. He served until 1985 then resigned and was succeeded by Christos Sartzetakis. It is famous his phrase during the 1989 political crisis and the political polarisation of the era: "Hellas has been transformed to an endless bedlam."
In 1990 he was re-elected President by a conservative parliamentary majority (under the conservative government of then Prime Minister Konstantinos Mitsotakis) and served until 1995, when he was succeeded by Kostis Stephanopoulos.
Konstantinos Karamanlis