tombs were intended for the project, but those of Lorenzo the Magnificent and his brother Giuliano (buried beneath the altar at the entrance wall) were never begun. The magnificent existing tombs are those of two more recently deceased and less well known family members whose careers had been cut tragically short by their comparatively early deaths: Giuliano di Lorenzo, Duke of Nemours (d. 1514, aged 37) and his nephew (d. 1519, age 27) Lorenzo di Piero, Duke of Urbino, whose daughter Catherine de' Medici became Queen of France). The architectural components of these tombs are similar and with sculptures offering contrast. Madonna and Child and patron saints On the main wall, Michelangelo's Madonna and Child is flanked by the Medici patron saints, Cosmas and Damian. The wall is unfinished. These three sculptures are placed over a rectangular altar. The sculptures of the saints were not carved by Michelangelo. Following models created by Michelangelo, the sculptures of the patron saints were executed later by Giovanni Angelo Montorsoli and Raffaello da Montelupo respectively and were placed on either side of the Madonna and Child. The statues representing the Medici family members above their respective tombs along the side walls are facing the Madonna and their lines of sight lead to her. Side tombs In a statement in the biography of Michelangelo that was published in 1553 by his disciple, Ascanio Condivi, and largely was based on Michelangelo's own recollections, Condivi gives the following description of the sculptures on the two Medici tombs: "The statues are four in number, placed in a sacristy... the sarcophagi are placed before the side walls, and on the lids of each there recline two big figures, larger than life, to wit, a man and a woman; they signify Day and Night and, in conjunction, Time which devours all things… And in order to signify Time he planned to make a mouse, having left a bit of marble upon the work (which [plan] he subsequently did not carry out because he was prevented by circumstances), because this little animal ceaselessly gnaws and consumes just as time devours everything”. Day Day is a marble sculpture by Michelangelo, datable to 1526–1531. It is paired with Night on the tomb of Giuliano de' Medici in the chapel. Night Night is a sculpture in marble (155x150 cm, maximum length 194 cm diagonally) by Michelangelo Buonarroti. Dating from 1526–1531, it is part of