Proceno is a small town in the Volsini Mountains locked between Lazio, Tuscany and Umbria with a strategic position from which it dominates the valley up to Monte Amiata and the view spreads from Radicofani to the Valle del Paglia.
A legend attributes its foundation to the great Etruscan king Porsenna, based in Chiusi. During a hunting trip, he was wounded by a wild boar and decided to spend the night in a forest surrounded by rivers.
He was attacked by a boar but managed to kill the animal despite being wounded and on the ground. Porsenna attributed his great strength to the goddess Uni to whom he promised to build a city with three doors to which he gave his name.
The emblem of Proceno perfectly encloses its history: the head of a wild boar (king Porsenna), the keys of St. Peter (due to its long membership in the Papal State) and the half-moon (for participation in the battle of Lepanto).
The stele that had been inscribed by Porsenna to thank the goddess Uni was never found but the presence of women is very strong with the patron saint Sant’Agnese Segni da Montepulciano.
Around one thousand a first castrum was erected, a fortified place to protect the inhabitants from invasions. At that time Proceno gravitated around the orbit of Orvieto and for some years suffered attacks and devastations such as that of 1083 by the emperor Henry IV. The current fortress dates back to 1093 thanks to the counts Bovacciani di Chiusi. Like many fortresses, this one was over time enriched and also took on the appearance of a noble residence by the various feudal lords who succeeded to control Proceno.
From the sixteenth century Proceno passed under the control of Cardinal Guido Ascanio Sforza and remained with the Sforza family for a long time and then moved on to the Mozzanti family and then the Selvi.
Because of its geographical position on the borders of the papal state, since the times of the Guelphs and Ghibellines, Proceno has changed loyalty many times but always coming back under the control of the Papal State.