The Sistine Chapel is best known for being the location of Papal conclaves; it is, however, the chapel of the Papal Chapel (Cappella Pontificia), one of the two bodies of the Papal household, called until 1968 the Papal Court (Pontificalis Aula). At the time of Pope Sixtus IV in the late 15th century, the Papal Chapel comprised about 200 people, including clerics, officials of the Vatican and distinguished laity. There were 50 occasions during the year on which it was prescribed by the Papal Calendar that the whole Papal Chapel should meet. Of these 50 occasions, 35 were masses, of which 8 were held in Basilicas, in general St. Peter's, and were attended by large congregations. These included the Christmas Day and Easter masses, at which the Pope himself was the celebrant. The other 27 masses could be held in a smaller, less public space, for which the Cappella Maggiore was used before it was rebuilt on the same site as the Sistine Chapel.

The Cappella Maggiore derived its name, the Greater Chapel, from the fact that there was another chapel also in use by the Pope and his retinue for daily worship. At the time of Pope Sixtus IV, this was the Chapel of Pope Nicholas V, which had been decorated by Fra Angelico. The Cappella Maggiore is recorded as existing in 1368. According to a communication from Andreas of Trebizond to Pope Sixtus IV, by the time of its demolition to make way for the present chapel, the Cappella Maggiore was in a ruinous state with its walls leaning.

The present chapel, on the site of the Cappella Maggiore, was designed by Baccio Pontelli for Pope Sixtus IV, for whom it is named, and built under the supervision of Giovannino de Dolci between 1473 and 1481. The proportions of the present chapel appear to closely follow those of the original. After its completion, the chapel was decorated with frescoes by a number of the most famous artists of the High Renaissance, including Botticelli, Domenico Ghirlandaio, Perugino, and Michelangelo.

The first mass in the Sistine Chapel was celebrated on 9 August 1483, the Feast of the Assumption, at which ceremony the chapel was consecrated and dedicated to the Virgin Mary.

The Sistine Chapel has maintained its function to the present day, and continues to host the important services of the Papal Calendar, unless the Pope is travelling. There is a permanent choir, the Sistine Chapel Choir, for whom much original music has been written, the most famous piece being Gregorio Allegri's Miserere.

The walls are divided into three main tiers. The lower is decorated with frescoed wall hangings in silver and gold. The central tier of the walls has two cycles of paintings, which complement each other, The Life of Moses and The Life of Christ. They were commissioned in 1480 by Pope Sixtus IV and executed by Domenico Ghirlandaio, Sandro Botticelli, Pietro Perugino, Cosimo Roselli and their workshops. The Florentine painters, who were to join Perugino, who was already there and was perhaps the superintendent of the whole decoration, left Florence on 27 October 1480: their call was part of a reconciliation project between Lorenzo de' Medici, the de facto ruler of Florence, and Pope Sixtus IV. The Florentines started to work in the Sistine Chapel as early as the Spring of 1481.

The upper tier is divided into two zones. At the lower level of the windows is a Gallery of Popes painted at the same time as the Lives. Around the arched tops of the windows are areas known as the lunettes which contain the Ancestors of Christ, painted by Michelangelo as part of the scheme for the ceiling.

The ceiling, commissioned by Pope Julius II and painted by Michelangelo between 1508 to 1512, has a series of nine paintings showing God's Creation of the World, God's Relationship with Mankind, and Mankind's Fall from God's Grace. On the large pendentives that support the vault are painted twelve Biblical and Classical men and women who prophesied that God would send Jesus Christ for the salvation of mankind.

In 1515, Raphael was commissioned by Pope Leo X to design a series of ten tapestries to hang around the lower tier of the walls. Raphael was at the time twenty-five and an established artist in Florence, with a number of wealthy patrons, yet he was ambitious, and keen to make an entry into the patronage of the papacy. Raphael was attracted by the ambition and energy of Rome.

Raphael saw the commission as an opportunity to be compared with Michelangelo, while Leo saw tapestries as his answer to the ceiling of Julius.The subjects he chose were based on the text of the Acts of the Apostles. Work began in mid-1515. Due to their large size, manufacture of the hangings was carried out in Brussels, and took four years under the hands of the weavers in the shop of Pieter van Aelst.

Although Michelangelo's complex design for the ceiling was not quite what his patron, Pope Julius II, had in mind when he commissioned Michelangelo to paint the Twelve Apostles, the scheme displayed a consistent iconographical pattern. However, this was disrupted by a further commission to Michelangelo to decorate the wall above the altar with The Last Judgement, 1537-1541. The painting of this scene necessitated the obliteration of two episodes from the Lives, several of the Popes and two sets of Ancestors. Two of the windows were blocked and two of Raphael's tapestries became redundant.
8. Sistine Chapel, Vatican City
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"..The Sistine Chapel is...the sanctuary of the theology of the human body"             - Pope John Paul II
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