The history of Semproniano is an old story, founded during the Roman Republic, when the family of the tribune Tiberius Sempronius Gracchus, fled from Rome after the conspiracy against Muzio Scevola, established in this rugged outcrop of travertine, the first core housing, Casale Simpronianum, named in honor of the heroic patriarch.
During the eleventh century, the noble Lombard family of Aldobrandeschi, was responsible for the destiny of Semproniano, an partially for the architectonic bases still visible today in some important monuments: the city walls and the towering fortress on the summit of the hill, the church of Santa Croce, the church of San Vincenzo and Anastasio, the Municipal palace.
Over the centuries, the village experienced ups and downs,involved in clashes between the regents Aldobrandeschi and Orsini, rival lords of the neighboring county of Sovana.
Towards the middle of the fourteenth century the village was subjected to Siena, thus remaining in the territory of the Republic until the sixteenth century, when it was temporarily conquered by the Spanish before joining permanently in the Grand Duchy of Tuscany. There followed a long period of neglect and decay, so that the center was later incorporated for a long time in the neighboring municipality of Roccalbegna, until it became independent on 29th January 1963.
Semproniano has, though in alternating phases, a noble past made famous by celebrities such as the founder, Tiberius Sempronius Gracchus, whose figure is related to the important agrarian law - the first major reform in defense of the people, and the knights of Order of the Templars who dwelt in these lands, leaving important evidences, covered by an aura of legend and mystery.
Recently the name of Semproniano is related to two important figures, both originate from here, who by their actions have helped spread the image of Italy in the World: Vico Consorti, versatile and talented sculptor, author of "Scala Santa "in St. Peter's Basilica in Rome and Mario Luzi, poet and writer, whose memory is commemorated in the basilica of Santa Croce in Florence with the remains of the great personalities of our country’s history.