The prior of the convent could not understand why Leonardo should meditate over his work, and, likewise in haste to have the picture finished, complained to Lodovico, who courteously entreated the artist to go on as rapidly as possible. Vasari says, "Leonardo, knowing the prince to be intelligent and judicious, determined to explain himself fully on the subject with him, although he had never chosen to do so with the prior. He therefore discoursed with him at some length respecting art, and made it perfectly manifest to his comprehension that men of genius are sometimes producing most when they seem to be laboring least, their minds being occupied in the elucidation of their ideas, and in the completion of those conceptions to which they afterwards give form and expression with the hand. He further informed the duke that there were still wanting to him two heads, one of which, that of the Saviour, he could not hope to find on earth.... "The second head still wanting was that of Judas, which also caused him some anxiety, since he did not think it possible to imagine a form of feature that should properly render the countenance of a man who, after so many benefits received from his Master, had possessed a heart so depraved as to be capable of betraying his Lord, and the Creator of the world; with regard to that second, however, he would make search, and after all--if he could find no better--he need never be at any great loss, for there would always be the head of that troublesome and impertinent prior. This made the duke laugh with all his heart; he declared Leonardo to be completely in the right: and the poor prior, utterly confounded, went away to drive on the digging in his garden, and left Leonardo in peace." The "Last Supper" was painted in oils instead of fresco, and soon began to fade. In 1515, when Francis I. was in Milan, he was so impressed with the picture that he determined to carry it back to France, and tried to find architects who could secure it from injury by defences of wood and iron so that it could be transported, but none could be found able to do it, and the project was abandoned. The painting was soon damaged by the refectory lying for some time under water. Later one of the monks made a doorway through it, cutting off the feet of Christ. In 1726 an artist named Belotti restored(?) it, leaving nothing untouched but the sky. His work proved unsatisfactory, and Mazza repainted everything except the heads of Matthew, Thaddeus, and Simon. The indignant people soon compelled him to cease, and the prior who had permitted it was banished from the convent. In 1796, when Napoleon entered Italy, the troops used the refectory as a stable. Three or four years later, it again lay under water for two weeks. At present, one is able to perceive only the general design as the work of Leonardo. Excellent copies were made by Da Vinci's pupils, so that the great picture has found its way into thousands of homes.