The foundation of the ancient Poseidonia probably dates back to the 7th century BC.
While the Greek settlers were building the first houses and sacred buildings (such as the one south-east of the temple of Cerere, whose foundations are the only thing left), Poseidonia people dedicated the sanctuary at the Sele river’s mouth to Hera, the main goddess of the colony, and of homeland as well. Within a century, more and more temples were built, and each of them had excellent decorations and rich votive offerings.
During the 5th century BC, the city goes through an incredibly productive period, with monuments improving on both quality and quantity. But, by the end of the century, the great Campania cities were conquered by the Samnites, and the Lucanians took Poseidonia. This transition affected the burial ritual; the Greek rite tombs, so basic and strict, disappear and a new kind of entombment appears, with coffins and rich vases, besides weapons for males and jewels for rich females.
In 273 BC, while Rome is battling Taranto and Pirro, Paestum became a Latin colony taking the name of “Paestum”. Monuments and inscriptions depict a deep change in the structure of the city, that undergoes extreme urban modifications, becoming more and more similar to other Latin cities.
During the reign of Vespasiano (70 AD) Paestum lost a colony, the colony of Flavia (named after the emperor’s family), made of veterans from the praetorian fleet in Capo Miseno.
Nevertheless, the city keeps on living, the way it has been living for so long, during the whole Roman imperial era, and starts declining during the 5th – 6th century AD.
Between the 8th and the 9th century AD, the city was definitively abandoned, as the swamp completely flooded it. People moved to the nearby mountains and there they founded Capaccio.
Even if the Neapolitan court already recognized the importance of this site in the 16th century, it was only in the 17th century that the official culture “rediscovered” the Paestum site, opening to the many travelers that came from all over Europe to admire its remains.