The Creation of Adam famous for his central figure of "Moses", completed in 1516. Of the other statues intended for the tomb, two known as the "Rebellious Slave" and the "Dying Slave", are now in the Louvre. During the same period, Michelangelo painted the ceiling of the Sistine Chapel, which took approximately four years to complete (1508–1512). According to Condivi's account, Bramante, who was working on the building of St Peter's Basilica, resented Michelangelo's commission for the Pope's tomb and convinced the Pope to commission him in a medium with which he was unfamiliar, in order that he might fail at the task. Michelangelo
Sistine Chapel 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.