Constantine Karamanlis was a prominent Greek politician who served as Prime Minister of Greece multiple times, first from 1955 to 1961 and later from 1974 to 1980. He played a crucial role in modernizing Greece and was instrumental in the country's transition to democracy after the military junta that ruled from 1967 to 1974. Karamanlis also served as the President of Greece from 1980 to 1985. He was a founding member of the New Democracy party, which aimed to promote liberal economic policies and strengthen Greece's ties with the European Union. His leadership significantly shaped Greece's political landscape in the 20th century.