A medieval church built directly into the ruins of three Roman temples — not in the Roman Forum, but over the old vegetable market by the river, where their columns still carry the walls.
At a glance
San Nicola in Carcere stands on the site of the Forum Holitorium, ancient Rome’s vegetable market, not the Roman Forum with which it is sometimes confused. The church absorbs three Republican-era temples built between the third and second centuries BC — dedicated to Juno Sospita, Janus and Spes — whose columns are still visible fused into its walls and façade, between the modern road and the Tiber.
Key facts
- Site — the Forum Holitorium (Rome’s ancient vegetable market), not the Roman Forum
- Three temples incorporated — Janus (dedicated by Gaius Duilius after his naval victory at Mylae, 260 BC), Juno Sospita, and Spes, all Republican-era (3rd–2nd century BC)
- First church here — probably 6th century; the first securely dated reference is an inscription of 1128
- 1599 rebuilding — overseen by Giacomo della Porta
- Interior art — works attributed to Guercino, Antoniazzo Romano and Orazio Gentileschi, and an Ascension altarpiece by Lorenzo Costa (c. 1500–1510)
History
The name “in Carcere” does not come from the Mamertine Prison near the Roman Forum, though tradition has confused the two since the thirteenth century. It comes from a separate, Byzantine-era prison on this spot, known as the Carcer ad Elephantum. A church is thought to have stood here from the 6th century, though the first firm documentary trace is an inscription on the façade dated 1128. The building was substantially reworked in 1599 under Giacomo della Porta, and it is his campaign, more than any single medieval phase, that gives the church its present appearance above the ancient base.
What you see
The three temples read differently on each side of the building. Three columns from the Temple of Juno Sospita are built into the church’s two successive façades, the tenth-century one and della Porta’s of 1599. Six columns from the Temple of Spes are visible along the south wall. On the north wall run the columns of the Temple of Janus — the oldest dedication of the three, made by the consul Gaius Duilius to mark Rome’s first naval victory, at Mylae in 260 BC, in the First Punic War.
Inside, the church keeps a plain three-aisled plan, its ancient masonry mostly hidden by later plaster and altars. Among the paintings are works attributed to Guercino, Antoniazzo Romano and Orazio Gentileschi, and an Ascension altarpiece by the Ferrarese painter Lorenzo Costa from around 1500–1510. The organ, built in 1908 by Nicola Morettini, is still in use.
Practical information
The church stands in the Sant’Angelo district, between the Theatre of Marcellus and the Tiber, a short walk from the Portico d’Ottavia and the Roman Ghetto. It functions as an active parish church; visiting hours follow the usual pattern of Roman churches, generally open through the morning and again in the late afternoon, closed to visitors during services.
Getting there
The address is Via del Teatro di Marcello 46. It is a short walk from the Theatre of Marcellus and from Piazza Bocca della Verità, within easy reach of the Circus Maximus and Capitoline Hill areas on foot, and served by several bus routes along Via del Teatro di Marcello and Lungotevere de’ Cenci.
Sources & resources
- San Nicola in Carcere — Wikipedia (EN), for the three temples, their dedications and dates, and the columns’ placement in the north and south walls
- Chiesa di San Nicola in Carcere — Wikipedia (IT), for the Carcer ad Elephantum, the thirteenth-century confusion with the Mamertine Prison, the 1599 rebuilding by Giacomo della Porta, the interior artworks and the 1908 organ
Historical events at this place (1)
- 2026 SEMI DI CARITA'
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