Tradition holds that Sovana was made a bishopric in the 5th century. A church on the site, still evident in the crypt, was founded in the 8th to 9th centuries and documented in a bull by Pope Nicholas II in 1061. It was reconstructed in Romanesque architectural style in 1248.[1] The Bishop of Palermo, Mamiliano, carried out evangelisation work in Sovana at the beginning of the 4th century. This early conversion to Christianity earned Sovana its appointment as an episcopal see in the 5th century.[2]