Basilica di San Paolo Fuori le Mura: The World's Largest Church After St. Peter's and One of Rome's Most Undervisited Monuments

Autore: La Redazione di www.tourleaderpro.com

Last updated: April 2026. Covers the basilica's history, the apostle's tomb, the apse mosaic, the cloister, the papal medallion series, and practical visit information.

In the early hours of July 15, 1823, a fire broke out in the roof of the Basilica di San Paolo Fuori le Mura. By morning, the basilica that had stood on this site since the Emperor Theodosius enlarged the original Constantinian church in the 380s AD — a building that had survived 1,400 years of invasions, earthquakes, floods, and the general entropy of Roman history — was a ruin. Only the apse with its fifth-century mosaic survived substantially intact. Pope Leo XII immediately organized reconstruction; the new basilica, funded by contributions from Catholic rulers across the world (the Czar of Russia donated malachite and lapis lazuli columns; the Khedive of Egypt sent alabaster), was consecrated in 1854.

The rebuilt San Paolo Fuori le Mura is the world's second largest church after St. Peter's and one of the most imposing buildings in Rome. It is also, for reasons that have more to do with its location (south of the old city center, away from the main tourist circuits) and its post-fire newness (nineteenth-century marble lacks the patina of medieval stonework) than with its actual quality, significantly less visited than comparable pilgrimage churches. On a typical weekday, you will find this basilica — with its 80 granite columns, its fifth-century apse mosaic, and its complete collection of papal portrait medallions — with perhaps a few dozen other visitors in the entire building.

History of San Paolo Fuori le Mura

The Apostle Paul was executed in Rome approximately 64-68 AD, during the Neronian persecution of Christians following the great fire of 64 AD. His death — decapitation, the privilege of a Roman citizen over crucifixion — took place at the Tre Fontane (Three Fountains) area, where the Abbey of the Tre Fontane still stands. He was buried along the Via Ostiense, the road leading south from Rome to the port of Ostia.

Constantine built the first church over the burial site in 314 AD, a modest building that proved inadequate for the pilgrimage traffic Paul's tomb generated. In 384-386 AD, the Emperors Theodosius I, Valentinian II, and Arcadius co-commissioned a much larger basilica, completed under Pope Siricius by 395 AD. This was the structure — five aisles, 800 meters in perimeter, with an apse mosaic of the fifth century — that burned in 1823. The rebuilt basilica follows the same floor plan as the Theodosian original but in the neoclassical marble vocabulary of the early nineteenth century, creating a space that is simultaneously enormous and somewhat cold.

What to See at San Paolo Fuori le Mura

The Apostle's Tomb

The tomb of Paul is beneath the high altar, accessible from the confession area in front of the altar. A white marble sarcophagus (second or third century AD) bearing the inscription "PAULO APOSTOLO MART" (Paul, Apostle, Martyr) was identified in 2009 by archaeologists using a probe camera through a small hole in the confessio floor. The sarcophagus contained bone fragments that radiocarbon dating placed to the first or second century AD. The Vatican announced this as confirmation of Paul's burial at this site — the first physical archaeological evidence supporting the tradition. The tomb is not visible to visitors but a glass panel in the confessio floor allows a view into the area above the sarcophagus.

The Apse Mosaic (Fifth Century)

The apse mosaic of San Paolo Fuori le Mura is one of the most important surviving early Christian mosaics in Rome. Dating to the fifth century AD (the Honorian period, with later restorations), it depicts Christ in majesty surrounded by saints and apostles, with the standing figures of Paul and Peter flanking the throne. The gold ground, the specific Byzantine-derived figure style, and the iconographic program represent the early Christian visual language at its most developed. Because the apse survived the 1823 fire substantially intact, the mosaic is genuinely ancient, not a nineteenth-century reconstruction.

The Papal Medallion Series

Running along the full perimeter of the nave above the arcade, a series of mosaic portrait medallions depicts every pope from Saint Peter to the current pontiff, in chronological sequence. The tradition dates to the thirteenth century; the first medallions were added at that time and have been continued with every subsequent papal election. The medallion of the current pope is always the last one in the series; there are now over 260 in the circuit. The extraordinary symbolic fact: when all the available space is filled, Catholic tradition holds that the end of days will have arrived. By current count, approximately 30-40 spaces remain. The medallions have recently begun using photographs as the basis for the mosaic portraits, which produces a somewhat different character from the earlier, more stylized representations.

The Cosmatesque Cloister

The cloister of San Paolo Fuori le Mura, accessible from the right aisle of the basilica, is one of the finest Cosmatesque cloisters in Rome — twelfth-thirteenth century, with columns of twisted and inlaid marble around the garden, and the characteristic geometric mosaic decoration on the column shafts and archivolts. The quality of the marble work and the preservation state are both exceptional. The cloister garden has a central well and orange trees, and in spring it is one of the most pleasant small enclosed spaces in Rome.

Q&A: Visiting San Paolo Fuori le Mura

Is San Paolo Fuori le Mura free?

Yes. The basilica is free to enter. The pinacoteca (painting museum in the basilica complex) has a small admission charge. The cloister is free with basilica entry.

Where is San Paolo Fuori le Mura and how do I get there?

Piazzale San Paolo 1, Rome — on the Via Ostiense, approximately 2 km south of the Aurelian Walls. Metro: San Paolo station (Line B), approximately 5 minutes' walk. Bus: several lines on Via Ostiense. The basilica is not in the main tourist circuit of central Rome; reaching it requires a specific trip. Opening hours: 7am-6:30pm daily.

How does San Paolo Fuori le Mura compare to the other pilgrimage basilicas?

San Paolo Fuori le Mura is the largest of the seven pilgrimage basilicas in terms of internal volume (second only to St. Peter's). In terms of historical depth, it is tied with San Giovanni in Laterano and San Pietro as the most important. In terms of visitor experience, it offers the most complete combination of early Christian elements (the apse mosaic), medieval craft (the Cosmatesque cloister), and the papal symbolism of the medallion series. It receives significantly fewer visitors than St. Peter's or San Giovanni, which makes the experience of the space notably better.

What is the papal tradition associated with San Paolo Fuori le Mura?

The Pope visits San Paolo Fuori le Mura at the beginning of each liturgical year to open the Jubilee celebrations if a Jubilee Year is in progress. The January 25 feast of the Conversion of Saint Paul is the occasion for an annual ecumenical service in the basilica attended by the Pope and representatives of other Christian churches, reflecting Paul's significance across Christian traditions. The June 29 feast of Saints Peter and Paul (the joint feast of Rome's two principal apostle-patrons) is the most important annual celebration at both St. Peter's and San Paolo.

What Nobody Tells You About San Paolo Fuori le Mura

The nineteenth-century marble of the rebuilt basilica creates an acoustic that is very different from the brick and plaster of older Roman basilicas. The nave of San Paolo Fuori le Mura has an extraordinary resonance for singing — the granite columns and marble floor reflect sound in long, warm reverberations. If you are in the basilica when a choir is rehearsing or when Gregorian chant is being sung in the apse (it occurs on feast days), the acoustic effect is one of the most beautiful experiences available in any Roman interior.

The courtyard (atrium) in front of the basilica entrance has an enormous statue of Paul with his sword — the instrument of his martyrdom (beheading) rather than crucifixion. The sword distinguishes Paul iconographically from Peter (who holds keys). Knowing this distinction makes navigating the iconographic program inside the basilica significantly easier.