Fortezza Orsini di Sorano

The Fortezza Orsini rises above Sorano on a spur of volcanic tuff. It combines a medieval Aldobrandeschi core with the Orsini’s sixteenth-century redesign for firearms, including a keep, bastions and underground galleries.

Why it matters

The fortress reflects the strategic importance of Sorano in the contest between the Orsini, Siena and later the Medici. Cosimo I praised the strength of its position. Its successive medieval and Renaissance structures occupy a tuff spur encircled on three sides by the Lente river.

What to notice

Above the entrance, the carved coat of arms combines the Aldobrandeschi lions with the Orsini rose and bars, beneath a heraldic bear. Underground levels contain low loopholes known as bocche di lupo, designed for firearms. The central keep housed the count’s headquarters, armoury, powder and saltpetre stores, foundry and prisons. The corner bastions held granaries, water depots and mills; cisterns cut into the tuff supplied water. A second moat was later filled during the Lorraine period.

Context and history

The northern sector preserves remains of the Aldobrandeschi rocca, first raised in the thirteenth century. The fief passed to the Orsini through the 1293 marriage of Anastasia Aldobrandeschi and Romano Orsini. The Orsini strengthened the fortress against firearms and, around the mid-sixteenth century, converted the old cassero into a residence. Sorano passed to the Medici in 1604, after which the fortress declined.