History

Sovana became a bishop’s seat in the 5th century, part of the early Christianization of the Maremma hill country. The oldest fabric still standing is the crypt, cut and vaulted in local tufa stone in the 8th or 9th century; the church built above it is first documented in a bull issued by Pope Nicholas II in 1061, by which point Sovana was already a fortified seat of the Aldobrandeschi family. Tradition attributes the crypt’s principal relics to Saint Mamiliano, a bishop of Palermo venerated locally after his death.

The building took its present Romanesque form mainly across the 11th to 13th centuries, with work continuing into 1248. This period coincided with the peak of Aldobrandeschi power and with the pontificate of Gregory VII, born Ildebrando in or near Sovana around 1015-1020 according to Visit Tuscany, the region’s official tourism authority; a rock-cut Etruscan tomb on the edge of the town still carries his name. The reconstruction drew on formulas from Lombard Romanesque architecture while already showing details that point toward Gothic forms, a transitional mix visible in the capitals and portal.

Sovana’s political and demographic decline from the 16th century onward left the cathedral largely untouched by later rebuilding, which is why its Romanesque core survives with comparatively little overlay. The 1986 reorganization of Tuscan dioceses merged Sovana with Pitigliano and Orbetello, and the building has held co-cathedral status ever since, still used for worship and open to visitors as part of the diocesan museum circuit.