Teatro Romano di Trieste

Roman Tergeste built its theatre against the slope of the San Giusto hill in the first century BC. Identified in 1814 and excavated in 1938, the theatre sits today between the old town's houses, its cavea sized for three and a half thousand spectators.

Why it matters

The theatre is among the most evocative surviving imprints of ancient Tergeste, a modest Roman colony whose urban fabric otherwise survives in fragments such as the Arco di Riccardo. Its value lies in what it shows about a small Adriatic port that could still afford masonry entertainment architecture on a classical model: a cavea built into the hillside, a two-storey scaena with statue niches, and a Trajan-era renovation paid for by a local worthy, Quintus Petronius Modesto, whose twin inscriptions survive in cast at the site. Standing at its rim, you read the colony's whole social geography in one glance.

What to notice

The seating banks lean directly against the slope of San Giusto, sparing the builders most of the substructure other theatres required. At the base, the semicircular orchestra and the "fossa" that housed the wooden stage floor mark where the action happened; behind them rise the scaena's backdrop walls, pierced by doors and niches that once framed statues of the imperial family and local notables — the originals now live in the city's lapidary collections. Brick and stone masonry survive from the Augustan phase, while the inscriptions recording Petronius Modesto's second-century embellishment document the theatre's later glory.

Context and history

The first building phase belongs to the Augustan age, in the late first century BC, when Tergeste was consolidating its colony status; the municipal archaeology itinerary dates the origins to around the mid-first century BC. In the early second century AD the theatre was restored and enriched under the patronage of Petronius Modesto, procurator and flamen of Trajan. After antiquity the structure was quarried for its stone and became the foundation for medieval houses — the neighbourhood's name, Rena Vecia ("old arena"), kept the memory alive. In 1814 the architect Pietro Nobile formally identified the ruin, but full excavation came only in 1938, when demolition and urban renewal cleared the later buildings from the cavea. Sculptures and inscriptions recovered here are displayed in the Lapidario Tergestino and the Orto Lapidario of the city's antiquities museum. Digging continued in the 1980s behind the theatre along via Donota, revealing a hillside dwelling and late-antique tombs now shown at the nearby Antiquarium.