Ponte Sisto: A Renaissance Bridge Across the Tiber in Rome
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- Medieval
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On this page8 sections
History
Ponte Sisto is a Renaissance stone bridge in Rome, Italy, rebuilt under Pope Sixtus IV between 1473 and 1479 over an earlier Roman crossing. Inaugurated for the Jubilee of 1475, a Catholic holy year associated with pilgrimage and religious observances, it was intended in part to improve movement toward Saint Peter’s after a crowd disaster at Ponte Sant’Angelo in 1450. The bridge connects Rome’s historic centre with Trastevere and bears the name of the pope who commissioned its reconstruction.
The Roman predecessor
The Renaissance bridge replaced the Pons Aurelius, also known as the Pons Antoninus, Pons Antonini, Pons Valentiniani, and the Gianicolense Bridge. An earlier crossing at the same location was traditionally associated with Marcus Vipsanius Agrippa, the Roman statesman and military commander closely connected with Augustus. It may have linked Agrippa’s properties on opposite banks of the Tiber. An inscription discovered in 1887 records work on the bridge during the reign of the emperor Claudius.
A fragment of the Fasti Ostienses, an ancient Roman chronological record associated with Ostia, records a restoration of the Agrippan bridge under Antoninus Pius, who ruled from AD 138 to 161. The bridge was extensively restored or rebuilt in AD 147, probably acquiring the names Pons Aurelius or Pons Antoninus during that period. Further major work took place in AD 366–367 under the emperors Valens and Valentinian I. Lucius Aurelius Avianius Symmachus, the prefect of Rome, directed this restoration, after which the crossing became associated with the name Pons Valentiniani.
The Roman predecessor later suffered damage in the late sixth century and was destroyed in the late eighth century. Its medieval remains were eventually reconstructed under Sixtus IV, creating the bridge now known as Ponte Sisto.
Renaissance and later history
The Renaissance design is traditionally attributed to Baccio Pontelli through the account of Giorgio Vasari, but documentary evidence does not confirm the attribution. The bridge was built under the patronage of Sixtus IV and was completed in 1479. Its first recorded repairs under the Renaissance papacy came in 1567, during the pontificate of Pope Pius IV. Vignola was initially entrusted with the work, which was later supervised by Matteo di Castello. Flood damage in 1598, during the pontificate of Clement VIII, led to further repairs to the paving and parapets.
On 20 August 1662, a confrontation on the bridge between Corsican soldiers who controlled it and Frenchmen in the retinue of the French ambassador began the Corsican Guard Affair. The crisis resulted in the disbanding of the Corsican Guard, a Corsican mercenary corps with policing duties in Rome.
Demolition was proposed in 1875, but the bridge was enlarged instead in 1877. Two cast-iron pedestrian gangways and new parapets altered its external profile. Those nineteenth-century additions were removed during restoration for the 2000 Jubilee, after which Ponte Sisto was restricted to pedestrian traffic. Two marble slabs commemorating Sixtus IV were removed in the 1990s after repeated vandalism, and copies were later installed at the bridgehead. Ponte Sisto is designated an Italian cultural property.
Remains
Ponte Sisto is a four-arch bridge built of stone on the foundations of the earlier Roman crossing. It is approximately 105 to 108 metres long and about 11 metres wide. The bridge runs between Via dei Pettinari in Regola, one of Rome’s historic administrative districts, on the eastern bank and Piazza Trilussa in Trastevere on the western bank. Its route also links the Campo de’ Fiori area and Via Giulia with Piazza Trilussa and continues toward the Janiculum.
Arches and flood opening
A circular opening, or oculus, pierces the masonry of the central supporting section between the two middle arches. This flood-pressure opening allowed rising water to pass through the bridge structure. Water reaching the oculus was treated as an indication that the Tiber had flooded. The present bridge therefore preserves a feature designed not only as part of its masonry but also as a practical means of judging flood conditions.
Roman architectural remains
During the Roman period, the predecessor bridge had a triumphal arch at its left-bank end, topped by large bronze statues. Remains of its balustrade posts, dedicatory inscriptions, arch, and sculptures were recovered from the Tiber in 1878 and 1892. These Roman elements are preserved in the National Roman Museum and provide physical evidence of the earlier bridge that preceded Ponte Sisto.
Commemorative slabs
Copies of two marble slabs stand at the left bridgehead. Their Latin inscriptions were composed by the Renaissance humanist Bartolomeo Platina. They commemorate Sixtus IV’s reconstruction of the formerly “broken” bridge and its usefulness to pilgrims attending the Jubilee. One of the inscriptions is dated 1475.
Water-supply structures
A fountain once stood at the corner of Via dei Pettinari and Via Giulia. Known as the Fontanone di Ponte Sisto or Fontanone dei Cento Preti, it was supplied by the Acqua Paola, a Roman water-supply system restored under Pope Paul V, who ruled from 1605 to 1621. The fountain was later moved to Piazza Trilussa on the opposite side of the bridge, where it continues to discharge water.
Ponte Sisto also carries Acqua Paola water across the Tiber through eight large pipes. The system brought water from Lake Bracciano to Trastevere and across the bridge toward the Campo Marzio. These pipes remain part of the bridge’s physical infrastructure and connect its Renaissance fabric with Rome’s later water-supply network.
