On 29 June, a public holiday in Rome, the Eternal City celebrates its two patron saints, St Peter and St Paul. This mostly religious feast involves special observations in churches, including the majestic St Peter's Basilica in Vatican City.
The celebration of Paul and Peter, which marks the martyrdom of the two apostles in the year 67, is one of the very earliest observations of Christianity. In fact, it predates the institution of Christmas.
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The Papal Basilica of Saint Peter (Latin: Basilica Sancti Petri), officially known in Italian as the Basilica Papale di San Pietro in Vaticano and commonly known as St. Peter's Basilica, is a Late Renaissance church located within the Vatican City. St. Peter's Basilica has the largest interior of any Christian church in the world, holding 60,000 people.
It is regarded as one of the holiest Christian sites. It has been described as "holding a unique position in the Christian world" and as "the greatest of all churches of Christendom"
In Catholic tradition, the basilica is the burial site of its namesake Saint Peter, who was one of the twelve apostles of Jesus and, according to tradition, first Bishop of Rome and therefore first in the line of the papal succession. Tradition and some historical evidence hold that Saint Peter's tomb is directly below the altar of the basilica. For this reason, many Popes have been interred at St Peter's since the Early Christian period. There has been a church on this site since the 4th century. Construction of the present basilica, over the old Constantinian basilica, began on April 18, 1506 and was completed on November 18, 1626



