The center was built in the early 10th century as a possession of the abbey of San Salvatore al Monte Amiata, which gave a thousand years after the rights of the Abbey of Saint Antimo.
Seggiano was ruled from Siena starting in the second half of the 13th century, during which exerted strong influences of the Salimbeni family until the 14th and the 15th century onwards Ugurgeri.