What countries competed in the ancient greek Olympics?

The ancient Greek Olympics primarily featured competitors from various city-states of Greece, including Athens, Sparta, Corinth, and Thebes. While the participants were predominantly Greek, athletes from other regions such as Sicily, Ionia, and even non-Greek areas occasionally took part. The games were a unifying event for the Greek world, emphasizing competition and camaraderie among the city-states. However, the focus remained largely on Greek participants throughout the games’ history.