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Konstantinos Kollias (Greek: Κωνσταντίνος Κόλλιας) (1901 – 13 July 1998) was a Greek Attorney General who was proclaimed Prime Minister by the Greek military junta of 1967–74 that overthrew Panagiotis Kanellopoulos' government on 21 April 1967.
Kollias died on 13 July 1998, at the age of 96. From 15 January 1998, when former India Prime Minister Gulzarilal Nanda died until his own death, Kollias was the world's oldest living former head of government.
| Prime Minister of Greece