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The Basilica of Saint Peter, officially known in Italian as the Basilica di San Pietro in Vaticano and colloquially called Saint Peter's Basilica, ranks second among the five major basilicas of Rome and its Vatican City enclave. Possibly the largest church in Christianity, it covers an area of 23,000 m² and has a capacity of over 60,000 people. One of the holiest sites of Christendom, it is believed to be the site of crucifixion and burial of the basilica namesake Saint Peter, one of the twelve apostles of Jesus and first Bishop of Antioch and later first Bishop of Rome. Tradition holds that his tomb is below the baldachino and altar; for this reason, many Popes, starting with the first ones, have been buried there. The current basilica was started in 1506 and was completed in 1626, and was built over the Constantinian basilica.
Contrary to popular belief, the basilica does not hold the distinction in the Roman Catholic Church of being the ecumenical motherchurch, as it is not the cathedral of the Pope (in fact, it is not a cathedral at all). That distinction belongs to the Basilica di San Giovanni in Laterano. However, due to the proximity of the Papal residence, most Papal ceremonies take place at St. Peter's. The basilica also holds a relic of the Cathedra Petri, the episcopal throne of the basilica's namesake when he led the Roman church, but which is no longer used. These are the sources of the confusion.
St. Peter's Square
Directly to the east of the church is the elliptical St. Peter's Square (Piazza San Pietro), built between 1656 and 1667, in the center of which is a 25.5 m tall obelisk. The obelisk was moved to its present location in 1585 by order of Pope Sixtus V. The obelisk dates back to the 13th century BC in Egypt, and was moved to Rome in the 1st century to stand in Nero's Circus some 250 m away. Including the cross on top and the base the obelisk reaches 40 m. On top of the obelisk there used to be a large bronze globe allegedly containing the ashes of Julius Caesar, this was removed as the obelisk was erected in St. Peter's Square. There are also two fountains in the square, the south one by Maderno (1613) and the northern one by Bernini (1675).
Latitude 41°54'08"N, Longitude 12°27'26"E
The Dome
The dome or cupola was designed by Michelangelo, who became chief architect in 1546. At the time of his death (1564), the dome was finished as far as the drum, the base on which domes sit. The dome was vaulted between 1585 and 1590 by the architect Giacomo della Porta with the assistance of Domenico Fontana, who was probably the best engineer of the day. Fontana built the lantern the following year, and the ball was placed in 1593.
As built, the double dome is brick, 42.3 m in interior diameter (almost as large as the Pantheon), rising to 120 m above the floor. In the early 18th century cracks appeared in the dome, so four iron chains were installed between the two shells to bind it, like the rings that keep a barrel from bursting. (Visitors who climb the spiral stairs between the dome shells can glimpse them.) The four piers of the crossing that support it are each 18 meters across. It is not simply its vast scale (136.57 m from the floor of the church to the top of the added cross) that makes it extraordinary. Michelangelo's dome is not a hemisphere, but a paraboloid: it has a vertical thrust, which is made more emphatic by the bold ribbing that springs from the paired Corinthian columns, which appear to be part of the drum, but which stand away from it like buttresses, to absorb the outward thrust of the dome's weight. The grand arched openings just visible in the illustration but normally invisible to viewers below, enable access (not to the public) all around the base of the drum; they are dwarfed by the monumental scale of their surroundings. Above, the vaulted dome rises to Fontana's two-stage lantern, capped with a spire.
The egg-shaped dome exerts less outward thrust than a lower hemispheric one (like Mansart's at Les Invalides) would have done. The dome conceived by Donato Bramante at the outset in 1503, was planned to be carried out with a single masonry shell, a plan that was discovered not to be feasible. San Gallo came up with the double shell, and Michelangelo improved on it. The piers at the crossing which were the first masonry to be laid, which were intended to support the original dome, were a constant concern, too slender in Bramante's plan, they were redesigned several times as the dome plans evolved.
Other domes around the world built since, are always compared to this one, which served as model: Saint Joseph's Oratory in Montreal, Quebec, St Paul's Cathedral in London, Les Invalides in Paris, United States Capitol in Washington, DC, Harrisburg, PA , and the more literal reproduction at the Basilica of Our Lady of Peace of Yamoussoukro, Cote d'Ivoire.
Entrances
Above the main entrance is the inscription IN HONOREM PRINCIPIS APOST PAVLVS V BVRGHESIVS ROMANVS PONT MAX AN MDCXII PONT VII (In honor of the prince of apostles; Paul V Borghese, pope, in the year 1612 and the seventh year of his pontificate). The façade is 115 meters wide and 46 meters high. On top are statues of Christ, John the Baptist, and eleven of the apostles; St. Peter's statue is inside. Two clocks are on either side of the top, the one on the left is electrically operated since 1931, with its oldest bell dating to 1288.
Between the façade and the interior is the portico. Mainly designed by Maderno, it contains an 18th century statue of Charlemagne by Cornacchini to the south, and an equestrian sculpture of Emperor Constantine by Bernini (1670) to the north. Entering The southernmost door, designed by Giacomo Manzù, is called the "Door of the Dead". The door in the center is by Antonio Averulino (1455), and preserved from the previous basilica.
The northernmost door is the "Holy Door" in bronze by Vico Consorti (1950), which is by tradition only opened for great celebrations such as Jubilee years. Above it are inscriptions. The top reads PAVLVS V PONT MAX ANNO XIII, the one just above the door reads GREGORIVS XIII PONT MAX. |
