Sozopol is one of the oldest towns on Bulgarian Thrace's Black Sea coast. The first settlement on the site dates back to the Bronze Age. Undersea explorations in the region of the port reveal relics of dwellings, ceramic pottery, stone and bone tools from that era. Many anchors from the second and first millennium BC have been discovered in the town's bay, a proof of active shipping since ancient times.
The current town was founded in the 7th century BC by Greek colonists from Miletus as Antheia. The name was soon changed to Apollonia, on account of a temple dedicated to Apollo in the town, containing a famous colossal statue of the god Apollo by Calamis, 30 cubits high, transported later to Rome by Lucullus and placed in the Capitol.
The coins, which begin in the fourth century BC, bear the name Apollonia and the image of Apollo; the imperial coins, which continue to the first half of the third century AD, and the Tabula Peutinger also contain the name Apollonia; but the "Periplus Ponti Euxini", 85, and the Notiti� episcopatuum have only the new name Sozopolis. In 1328 Cantacuzene (ed. Bonn, I, 326) speaks of it as a large and populous town. The islet on which it stood is now connected with the mainland by a narrow tongue of land. Its inhabitants, in the past mostly Greeks, lived by fishing and agriculture.
The town established itself as a trade and naval centre in the following centuries. It kept strong political and trade relations with the cities of Ancient Greece � Miletus, Athens, Corinth, Heraclea Pontica and the islands Rhodes, Chios, Lesbos, etc. Its trade influence in the Thracian territories was based on a treaty with the rulers of the Odrysian kingdom dating from the fifth century BC.
The symbol of the town � the anchor, present on all coins minted by Apollonia since the sixth century BC, is proof of the importance of its maritime trade. The rich town soon became an important cultural centre. At these times it was called
