There is speculation that Susak has been settled for at least two thousand years by Illyrians, Greek sailors, and Romans (as a summer resort for wealthier Roman citizens). While there is little or no surviving evidence from Susak supporting this claim, there are ancient remains - including buildings, mosaics, coins, and burial sarcophagi - on other islands surrounding Susak. The latest Susak would have been settled is during the early Middle Ages. Assuming Susak was settled then, probably Slavs would have ruled the island under the Byzantine Empire during that time period (circa 500 CE through circa 1000 CE).