The first traces of human presence in the southern plain of Campania date to the ninth through sixth centuries BCE.
These includes a necropolis with 1,400 tombs, attributed to the Sarrastri tribe.
Samnites invaded the territory in 421 BCE.

The earliest mention of San Valentino (as Balentino) is from an 868 CE document, preserved in the Trinità della Cava abbey.
Its territory was held by the Del Balzo and Capece Minutolo families until the abolition of feudalism in 1806.
It assumed the current denomination after the unification of Italy, in 1861.
The first traces of human presence in the southern plain of Campania date to the ninth through sixth centuries BCE. These includes a necropolis with 1,400 tombs, attributed to the Sarrastri tribe. Samnites invaded the territory in 421 BCE.
The earliest mention of San Valentino (as Balentino) is from an 868 CE document, preserved in the Trinità della Cava abbey. Its territory was held by the Del Balzo and Capece Minutolo families until the abolition of feudalism in 1806. It assumed the current denomination after the unification of Italy, in 1861.
San Valentino Torio