Answer
Papadopoulos' regime was overthrown in 1974 by Dimitrios Ioannidis, who was the leader of the military junta that had ruled Greece since 1967. Ioannidis and his fellow officers were unhappy with Papadopoulos' handling of the Turkish invasion of Cyprus, which had led to widespread criticism and unrest in Greece. They also believed that Papadopoulos was becoming increasingly authoritarian and was no longer acting in the best interests of the country.