Pantheon, Rome

History

The original Pantheon was built in 27 BC under the Roman Republic, during the third consulship of Marcus Vipsanius Agrippa, and his name is inscribed on the portico of the building. The inscription reads M.AGRIPPA.L.F.COS.TERTIUM.FECIT, "Marcus Agrippa, son of Lucius, Consul for the third time, built this."

In fact, Agrippa's Pantheon was destroyed by fire in AD 80, and the Pantheon was completely rebuilt in about AD 125, during the reign of the Emperor Hadrian, as date-stamps on the bricks reveal. It was totally reconstructed, with the text of the original inscription (referring to Agrippa) added to the new facade, a common practice in Hadrian's rebuilding projects all over Rome.

Hadrian was a cosmopolitan emperor who travelled widely in the east and was a great admirer of Greek culture. He seems to have intended the Pantheon, a temple to all the gods, to be a sort of ecumenical or syncretist gesture to the subjects of the Roman Empire who did not worship the old gods of Rome, or who (as was increasingly the case) worshipped them under other names.

In AD 609 the Byzantine emperor Phocas gave the building to Pope Boniface IV, who reconsecrated it as a Christian church, the Church of Mary and all the Martyr Saints (Santa Maria ad Martyres), which title it retains.

The building's consecration as a church saved it from the abandonment and spoliation which befell the majority of ancient Rome's buildings during the early mediaeval period. The only loss has been the external sculptures, which adorned the pediment above Agrippa's inscription. The marble interior and the great bronze doors have survived, although the latter have been restored several times.

When St. Peter's Basilica was being rebuilt under Pope Urban VIII, the Pope ordered the bronze ceiling of the Pantheon's portico melted down. The bronze was used by Bernini in creating the baldachin above the main altar of the basilica. This led to the Latin proverb, "Quod non fecerunt barbari, fecerunt Barberini" ("What the barbarians did not do, the Barberinis [family name of Urban VIII] did").

Since the Renaissance the Pantheon has been used as a tomb. Among those buried there are the painters Raphael and Annibale Caracci, the architect Baldassare Peruzzi and two kings of Italy: Vittorio Emanuele II and Umberto I, as well as Vittorio Emanuele's Queen, Margharita.

Although Italy has been a republic since 1946, volunteer members of Italian monarchist organisations maintain a vigil over the royal tombs in the Pantheon. This has aroused protests from time to time from republicans, but the Catholic authorities allow the practice to continue, although the Italian Ministry of Cultural Heritage [1] is in charge of the security and maintenance. The Pantheon is still a church and Masses are still celebrated in the church, particularly for weddings.
, of the Pantheon

Structure

The building is circular with a portico of three ranks of huge granite Corinthian columns (8 in the first rank and 16 in total) under a pediment opening into the rotunda, under a coffered, concrete dome, with a central opening (oculus), open to the sky. The height to the oculus and the diameter of the interior circle are the same (43 metres), so the whole interior would fit exactly within a cube (alternatively, the interior could house a sphere 43 metres in diameter). The dome is the largest surviving from antiquity, and was the largest dome in western Europe until Brunelleschi's dome of the Duomo of Florence was completed in 1436.
The composition of the Roman concrete used in the dome remains a mystery. An unreinforced dome in these proportions made of modern concrete would hardly stand the load of its own weight, since concrete has very low tensile strength, yet the Pantheon has stood for centuries. It is known from Roman sources that their concrete is made up of a pasty hydrate lime; pozzolanic ash from a nearby volcano; and fist-sized pieces of rock. In this, it is very similar to modern concrete. The high tensile strength appears to come from the way the concrete was applied in very small amounts and then was tamped down to remove excess water at all stages. This appears to have prevented the air bubbles that normally form in concrete as the material dries, thus increasing its strength enormously.
of the Pantheon's portico provided a standard for Renaissance and later architects.
As the best preserved example of monumental Roman architecture, the Pantheon was enormously influential on European and American architects from the Renaissance to the 19th century. Numerous city hallss, universities and public libraries echo its portico-and-dome structure. Examples of notable buildings influenced by the Pantheon include Thomas Jefferson's Rotunda at the University of Virginia, Low Library at Columbia University, New York, and the State Library of Victoria in Melbourne, Australia.

Further reading