Segni (ancient Signia, one of the oldest Latin colonies, founded according to tradition in 495 BC under the Roman king Tarquinius Superbus, though the historical tradition is uncertain. Definitively documented as a Roman colony from the early Republic) is the Lepini mountain town that specialists in pre-Roman Italian archaeology consider the single most important site for the study of opus polygonale (the megalithic dry-stone fortification technique) in Lazio: the Segni walls (surviving in sections around the entire circuit of the ancient city, accessible from multiple points in the modern town) are the most extensive, the best preserved, and the most varied in their technical execution of any polygonal wall site in central Italy. Scholars distinguish four types of opus polygonale (from the roughest, Type I, where the blocks are barely shaped, to the finest, Type IV, where the joints are cut to precision tolerances without mortar) and the Segni walls show all four types in different sections of the circuit, making the town a one-stop reference site for the full range of the tradition.
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Segni: Walls and Cathedral
The Polygonal Walls Circuit
The Segni polygonal walls (the ancient Signia fortification circuit, approximately 3.2km in total length, of which significant sections survive at heights of 2-5 meters) are accessible from multiple points in the modern town and surrounding olive groves. The best-preserved sections: the northern wall (on the approach from the Valmontone direction, where a 100-meter continuous wall section in Type III-IV masonry is visible from the road), the Porta Saracinesca (the surviving gate in the eastern wall, the original Roman gate with its distinctive polygonal arch, one of the few surviving examples of a fully preserved polygonal gateway in central Italy), and the southern circuit (less preserved but with the most massive individual blocks, some exceeding 3 tons).
The Cathedral and Its Crypt
The Cattedrale di San Bruno (the Segni cathedral, built on the site of the ancient Roman acropolis) has the specific quality of a Lazio Romanesque church that hasn't been modified in the typical 18th-century Baroque renovation that erased so much medieval church architecture in the region: the exterior Romanesque facade and the interior with its early medieval crypt (the crypt contains the tomb of Saint Bruno of Segni, the 11th-century bishop of Segni who was simultaneously the papal theologian at the court of Gregory VII, the pope of the Investiture Controversy, and who left the specific theological writing that documents the 11th-century reform papacy at its most intellectually demanding) are preserved in a state that the Segni cathedral sharing its remote position with Boville Ernica and Alatri means the Ciociaria-Lepini Romanesque tradition remains largely unknown to the visitors who flock to the Tuscany and Umbria equivalents.
Q&A: Segni
How do I reach Segni from Rome?
By car: 55km southeast via the A1 (exit Valmontone) then SP roads to Segni. Approximately 1 hour. By regional train: Roma Termini to Segni-Paliano station (45 minutes, one of the faster regional connections in the Lazio network, with trains approximately every 30-60 minutes). From the station (in the valley floor below the town) a steep walk or taxi to the hilltop. Best combined with Paliano (5km east, the Colonna family castle and historic center) and Anagni (20km east, the papal city where Boniface VIII was struck by Sciarra Colonna in 1303).
