Why did Greece change its constitution after the military dictatorship ended?

Following the collapse of the military dictatorship that ruled Greece from 1967 to 1974, the country underwent a transition to restore democracy. The current constitution, introduced in 1975, was a fundamental part of this transition, designed to replace the authoritarian framework of the previous regime and establish a stable parliamentary republic.21

The adoption of this new constitution was essential to legitimize the restored democratic order and provide a legal foundation for the new government under Konstantinos Karamanlis, who was tasked with rebuilding the country's political institutions. By establishing a parliamentary system, the 1975 constitution sought to ensure that power resided with elected representatives rather than military or unelected authorities, effectively ending the era of military rule.21