One single work was realised amidst all these dreams: the Christ of the Minerva, and it is the coldest and dullest thing he ever did--a work of Michelangelo (and this is almost unbelievable) which is commonplace and uninspiring. It can hardly even be called his, for he did not finish it himself, but gave it over to the neglect of his assistant, Pietro Urbano, a bungler without talent and incurably lazy, who, when he was ordered to accompany the statue to Rome and to finish it, ruined it by his awkwardness and left it there hopelessly marred.[38] [Illustration: THE ERYTHREAN SIBYL Ceiling of the Sistine Chapel (1508-1512).] Cardinal Giulio de' Medici, when he had extricated Michelangelo from this hopeless enterprise, determined to turn his genius in a new direction and one in which he could direct him more closely. He entrusted him with the construction of the new sacristy of S. Lorenzo and the tombs of the Medici. In November, 1520, Michelangelo submitted to him a drawing which met with his approval. This original plan was for four tombs: those of Lorenzo the Magnificent, Giuliano his brother, his son Giuliano, Duke of Nemours, and his grandson Lorenzo, Duke of Urbino. The work was begun before April, 1521, but was not pushed vigorously until after the nomination on November 19, 1522, of Cardinal Giulio de' Medici to the pontifical throne under the name of Clement VII.[39] In May, 1524, Clement VII accepted the idea, suggested to him by the flattering Salviati, of adding to the four sarcophagi already planned tombs for Leo X and for himself and of giving them the place of honour. In June Michelangelo sent him a new plan as well as the drawings for the Library of S. Lorenzo, the building of which had also been entrusted to him.