Argyruntum was on a 3.4-acre (14,000 m2), now silted, island in the area east of the port. Emperor Tiberius erected protective walls and towers. Findings from about four hundred tombs are an evidence of great prosperity and trade relations in the Mediterranean. The oldest relic in the vicinity of Starigrad is the St. George Chapel in Rovanjska and St. Peter's Chapel in Starigrad from the ninth or tenth century. Mediaeval traces are the castles "Večka kula" (old names were: Vega, Vegium (not to be confused with Vegium (Karlobag).) and Wezuliae), which was the mediaeval Harbormasters' office, on a peninsula east of Starigrad and the "Paklarić" on the prehistoric ruins of the entrance to the Velika Paklenica.