The history of Salerno has very ancient origins; human residences are attested in the territory of the city in the third and second millennium BC. It is only around the 6th century BC that the first evidence of an Etruscan settlement that stood on the Irno river, near the current Fratte district, comes to light. However, it is with Roman domination that the first foundations of the city institution were found, documented since 197 BC, the year in which the Romans founded a castrum (Roman army camp) on Mount Bonadei to monitor the populations of the agro picentino countryside during the Second Punic War. As for the denomination, the original name, Salernum, derives from the small pre-Roman city of Irnthi, whose existence was attested precisely by the discovery of a necropolis from the 6th-5th century BC near Fratte.