Apollonia of Thrace was an ancient Greek city located on the coast of the Black Sea, in what is now Bulgaria. Founded in the 6th century BCE by settlers from Miletus, it became an important center for trade and culture in the region. The city was known for its strategic harbor and was a hub for commerce between the Greek world and the Thracian hinterland. The city was also famous for its temples and public buildings, including a notable temple dedicated to the god Apollo. Over time, Apollonia flourished and became a significant player in the political and economic landscape of the ancient world, contributing to the spread of Greek culture in Thrace.