The Sistine Chapel is best known for being the location of Papal conclaves; it is, however, the physical chapel of the Papal Chapel. At the time of Pope Sixtus IV in the late 15th century, this corporate body 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.[2] Of these 50 occasions, 35 were masses, of which 8 were held in Basilicas, in general St. Peters, 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. Pope Sixtus IV 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.[3] 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.[4] 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, Ghirlandaio, Perugino, and Michelangelo. [3] The first mass in the Sistine Chapel was celebrated on August 9, 1483, the Feast of the Assumption, at which ceremony the chapel was consecrated and dedicated to the Virgin Mary.[5] 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 Allegri's Miserere.[6] Source: en.wikipedia.org/wiki/Sistine_Chapel#History You can also see Non-HDR version right here - www.flickr.com/photos/virt_/3816121445/