Ancient Greece

Greek sailors and merchants reached almost every part of the Mediterranean including the shores of today’s Croatia; there they have founded city-states in which they lived quite isolated. Trade cities on the Adriatic shores such as Tragurion (today Trogir), Salona (Solin near Split), Epetion today Poreč), Issa (Vis), were geometrically shaped and had villas, harbors, public buildings, temples and theatres. While the Greek colonies were flourishing on the island, on the continent the Illyrians were organizing their centers. Their art was greatly influenced by Greek art, and they even copied some. In the Neretva Delta, there was an important influence of the Hellenistic Illyrian tribe of Daors.

Source: Wikipedia