The Pantheon (, ; Latin: Pantheum, from Ancient Greek Πάνθειον (Pantheion) '[temple] of all the gods') is an ancient Polytheist temple in Rome, Italy, originally built under Roman emperor Augustus (27 BC–AD 14) and reconstructed under Hadrian (117–138).
Since AD 609, it has served as the Roman Catholic Basilica of Saint Mary and the Holy Martyrs (Italian: Basilica di Santa Maria ad Martyres) with the special Pontifical privilege of immemorial status.
The Pantheon was built on the site of an earlier temple, which had been commissioned by Marcus Vipsanius Agrippa during the reign of Augustus. After the original burnt down, the present building was completed by the emperor Hadrian and probably dedicated c. AD 126. Its date of construction is uncertain, because Hadrian chose to re-inscribe the new temple with Agrippa's original date inscription from the older temple.
The building is round in plan, except for the portico with large granite Corinthian columns (eight in the first rank and two groups of four behind) under a pediment. A rectangular vestibule links the porch to the rotunda, which is under a coffered concrete dome made from Roman concrete (also called opus caementicium), with a central opening (oculus) to the sky. Almost two thousand years after it was built, the Pantheon's dome is still the world's largest unreinforced concrete dome. The height to the oculus and the diameter of the interior circle are the same, 43 metres (142 ft).
It is one of the best-preserved of all Ancient Roman buildings, in large part because it has been in continuous use throughout its history. Since the 7th century, it has been a church dedicated to St. Mary and the Martyrs (Latin: Sancta Maria ad Martyres), known as "Santa Maria Rotonda". The square in front of the Pantheon is called Piazza della Rotonda. The Pantheon is a state property, managed by Italy's Ministry of Cultural Heritage and Activities and Tourism through the Polo Museale del Lazio.
The Pantheon's large circular domed cella, with a conventional temple portico front, was unique in Roman architecture. Nevertheless, it became a standard exemplar when classical styles were revived, and has been copied many times by later architects.
Etymology
The name "Pantheon" is from the Ancient Greek "Pantheion" (Πάνθειον) meaning "of, relating to, or common to all the gods": (pan- / "παν-" meaning "all" + theion / "θεῖον"= meaning "of or sacred to a god"). The simplest explanation for the name is that the Pantheon was a temple dedicated to all the gods. However, the concept of a temple dedicated to all the gods has been questioned. Ziegler tried to collect evidence of pantheons, but his list consists of simple dedications "to all the gods" or "to the Twelve Gods", which are not necessarily true pantheons in the sense of a temple housing a cult that literally worships all the gods. The only definite pantheon recorded earlier than Agrippa's was at Antioch in Syria, though it is only mentioned by a sixth-century source. Cassius Dio, a Roman senator who wrote in Greek, speculated that the name of the Pantheon comes either from the statues of many gods placed around this building, or from the resemblance of the dome to the heavens. According to Adam Ziolkowski, this uncertainty strongly suggests that "Pantheon" (or Pantheum) was merely a nickname, not the formal name of the building.
Godfrey and Hemsoll point out that ancient authors never refer to Hadrian's Pantheon with the word aedes, as they do with other temples, and the Severan inscription carved on the architrave uses simply "Pantheum", not "Aedes Panthei" (temple of all the gods). Livy wrote that it had been decreed that temple buildings (or perhaps temple cellae) should only be dedicated to single divinities, so that it would be clear who would be offended if, for example, the building was struck by lightning, and because it was only appropriate to offer sacrifice to a specific deity (27.25.7–10). Godfrey and Hemsoll maintain that the word Pantheon "need not denote a particular group of gods, or, indeed, even all the gods, since it could well have had other meanings. ... Certainly the word pantheus or pantheos, could be applicable to individual deities. ... Bearing in mind also that the Greek word θεῖος (theios) need not mean 'of a god' but could mean 'superhuman', or even 'excellent'."
Since the French Revolution, when the church of Sainte-Geneviève in Paris was deconsecrated and turned into the secular monument called the Panthéon of Paris, the generic term pantheon has sometimes been applied to other buildings in which illustrious dead are honoured or buried.
History
Ancient
In the aftermath of the Battle of Actium (31 BC), Marcus Vipsanius Agrippa started an impressive building program. The Pantheon was a part of the complex created by him on his own property in the Campus Martius in 29–19 BC, which included three buildings aligned from south to north: the Baths of Agrippa, the Basilica of Neptune, and the Pantheon. It seems likely that the Pantheon and the Basilica of Neptune were Agrippa's sacra privata, not aedes publicae (public temples). The former would help explain how the building could have so easily lost its original name and purpose (Ziolkowski contends that it was originally the Temple of Mars in Campo) in such a relatively short period of time.
The only passages referring to the decoration of the Agrippan Pantheon written by an eyewitness are in Pliny the Elder's Natural History. From him we know that "the capitals, too, of the pillars, which were placed by M. Agrippa in the Pantheon, are made of Syracusan bronze", that "the Pantheon of Agrippa has been decorated by Diogenes of Athens, and the Caryatides, by him, which form the columns of that temple, are looked upon as masterpieces of excellence: the same, too, with the statues that are placed upon the roof," and that one of Cleopatra's pearls was cut in half so that each half "might serve as pendants for the ears of Venus, in the Pantheon at Rome".
The form of Agrippa's Pantheon is debated. As a result of excavations in the late 19th century, archaeologist Rodolfo Lanciani concluded that Agrippa's Pantheon was oriented so that it faced south, in contrast with the current layout that faces north, and that it had a shortened T-shaped plan with the entrance at the base of the "T". This description was widely accepted until the late 20th century. While more recent archaeological diggings have suggested that Agrippa's building might have had a circular form with a triangular porch, and it might have also faced north, much like the later rebuildings, Ziolkowski complains that their conclusions were based entirely on surmise; according to him, they did not find any new datable material, yet they attributed everything they found to the Agrippan phase, failing to account for the fact that Domitian, known for his enthusiasm for building and known to have restored the Pantheon after 80 AD, might well have been responsible for everything they found. Ziolkowski argues that Lanciani's initial assessment is still supported by all of the finds to date, including theirs; he expresses scepticism because the building they describe, "a single building composed of a huge pronaos and a circular cella of the same diameter, linked by a relatively narrow and very short passage (much thinner than the current intermediate block), has no known parallels in classical architecture and would go against everything we know of Roman design principles in general and of Augustan architecture in particular."
The Augustan Pantheon was destroyed along with other buildings in a fire in 80 AD. Domitian rebuilt the Pantheon, which was burnt again in 110 AD.
It had long been thought that the current building was built by Agrippa, with later alterations undertaken, and this was in part because of the Latin inscription on the front of the temple which reads: M⸱AGRIPPA⸱L⸱F⸱COS⸱TERTIVM⸱FECIT (Latin: M[arcus] Agrippa L[ucii] f[ilius] co[n]s[ul] tertium fecit, lit. 'Marcus Agrippa, son of Lucius, made [this building] when consul for the third time.') However, archaeological excavations have shown that the Pantheon of Agrippa had been completely destroyed except for the façade. Lise Hetland argues that the present construction began in 114, under Trajan, four years after it was destroyed by fire for the second time (Oros. 7.12). She reexamined Herbert Bloch's 1959 paper, which is responsible for the commonly maintained Hadrianic date, and maintains that he should not have excluded all of the Trajanic-era bricks from his brick-stamp study. Her argument is particularly interesting in light of Heilmeyer's argument that, based on stylistic evidence, Apollodorus of Damascus, Trajan's architect, was the obvious architect.
The degree to which the decorative scheme should be credited to Hadrian's architects is uncertain. Finished by Hadrian but not claimed as one of his works, it used the text of the original inscription on the new façade (a common practice in Hadrian's rebuilding projects all over Rome; the only building on which Hadrian put his own name was the Temple to the Deified Trajan). How the building was actually used is not known. The Historia Augusta says that Hadrian dedicated the Pantheon (among other buildings) in the name of the original builder (Hadr. 19.10), but the current inscription could not be a copy of the original; it does not tell us to whom Agrippa's foundation was dedicated, and, in Ziolkowski's opinion, it was highly unlikely that in 25 BC Agrippa would have presented himself as "consul tertium." On coins, the same words, "M. Agrippa L.f cos. tertium", were the ones used to refer to him after his death; consul tertium serving as "a sort of posthumous cognomen ex virtute, a remembrance of the fact that, of all the men of his generation apart from Augustus himself, he was the only one to hold the consulship thrice." Whatever the cause of the alteration of the inscription might have been, the new inscription reflects the fact that there was a change in the building's purpose.
Cassius Dio, a Graeco-Roman senator, consul and author of a comprehensive History of Rome, writing approximately 75 years after the Pantheon's reconstruction, mistakenly attributed the domed building to Agrippa rather than Hadrian. Dio appears to be the only near-contemporaneous writer to mention the Pantheon. Even by 200, there was uncertainty about the origin of the building and its purpose:
Agrippa finished the construction of the building called the Pantheon. It has this name, perhaps because it received among the images which decorated it the statues of many gods, including Mars and Venus; but my own opinion of the name is that, because of its vaulted roof, it resembles the heavens.
— Cassius Dio History of Rome 53.27.2
In 202, the building was repaired by the joint emperors Septimius Severus and his son Caracalla (fully Marcus Aurelius Antoninus), for which there is another, smaller inscription on the architrave of the façade, under the aforementioned larger text. This now-barely legible inscription reads:
In English, this means:
Medieval
In 609, the Byzantine emperor Phocas (who also had his namesake column constructed nearby) gave the building to Pope Boniface IV, who converted it into a Christian church and consecrated it to St. Mary and the Martyrs on 13 May 609: "Another Pope, Boniface, asked the same [Emperor Phocas, in Constantinople] to order that in the old temple called the Pantheon, after the pagan filth was removed, a church should be made, to the holy virgin Mary and all the martyrs, so that the commemoration of the saints would take place henceforth where not gods but demons were formerly worshipped." Twenty-eight cartloads of holy relics of martyrs were said to have been removed from the catacombs and placed in a porphyry basin beneath the high altar. On its consecration, Boniface placed an icon of the Mother of God as 'Panagia Hodegetria' (All Holy Directress) within the new sanctuary.
The building's consecration as a church saved it from the abandonment, destruction, and the worst of the spoliation that befell the majority of ancient Rome's buildings during the Early Middle Ages. However, Paul the Deacon records the spoliation of the building by the Emperor Constans II, who visited Rome in July 663:
Remaining at Rome twelve days he pulled down everything that in ancient times had been made of metal for the ornament of the city, to such an extent that he even stripped off the roof of the church [of the blessed Mary], which at one time was called the Pantheon, and had been founded in honour of all the gods and was now by the consent of the former rulers the place of all the martyrs; and he took away from there the bronze tiles and sent them with all the other ornaments to Constantinople.
The rotunda roof remained uncovered for nearly a century until it was lined with lead sheets by Pope Gregory III (731–741). A number of inscriptions and stamps on the roof attest to its maintenance. In 1270, a belfry was constructed on top of the gable of the portico; a stone inscription recording its construction is located in the pronaos to the right of the doors. Much fine exterior marble covering the brickwork has been removed over the centuries. Sculptures which adorned the pediment above Agrippa's inscription were also lost.
Three granite columns along the eastern end of the portico were severely damaged or collapsed during the medieval era and were buttressed by a brick and rubble wall. The wall and attached buildings blocked off access along the Via della Minerva, and the portico became partially blocked and congested with vendor stalls. The level of the piazza also built up over time such that visitors had to descend down stairs to the level of the pronaos until the 17th century. Walls are thought to have been built between some columns, with lintels attached via notches cut out of the columns, the traces of which are still visible.