Why weren't foreigners aloud to live in Greece?

Historically, various restrictions on foreigners living in Greece were influenced by factors such as national security, economic considerations, and cultural preservation. In certain periods, particularly during times of political turmoil or conflict, the Greek government implemented measures to limit foreign presence to protect national interests. Additionally, Greece's geographical location and its identity as a nation have also shaped policies regarding Immigration and foreign residency. Over time, these restrictions have evolved, especially with Greece's integration into the European Union, which has facilitated greater movement and residency for Europeans.