Sistine Chapel ceiling according to the Gospel of Matthew. However, the genealogy is now incomplete, since the two lunettes of the windows in the Altar wall were destroyed by Michelangelo when he returned to the Sistine Chapel in 1537 to paint The Last Judgment. Only engravings, based on a drawing that has since been lost, remain of them. The sequence of tablets seems a little erratic as one plaque has four names, most have three or two, and two plaques have only one. Moreover, the progression moves from one side of the building to the other, but not consistently, and the figures the
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.