The Medici Chapels (Cappelle medicee) are two structures at the Basilica of San Lorenzo, Florence, Italy, dating from the 16th and 17th centuries, and built as extensions to Brunelleschi's 15th-century church, with the purpose of celebrating the Medici family, patrons of the church and Grand Dukes of Tuscany. The Sagrestia Nuova ("New Sacristy") was designed by Michelangelo. The larger Cappella dei Principi ("Chapel of the Princes"), although proposed in the 16th century, was not begun until the early 17th century, its design being a collaboration between the family and architects. These are not to be confused with the Magi Chapel in the Palazzo Medici Riccardi, then the main Medici home, that houses a famous cycle of frescoes by Benozzo Gozzoli, painted around 1459. The Sagrestia Nuova The Sagrestia Nuova was intended by Cardinal Giulio de' Medici and his cousin Pope Leo X as a mausoleum or mortuary chapel for members of the Medici family. It balances Brunelleschi's Sagrestia Vecchia, the "Old Sacristy" nestled between the left transept of San Lorenzo, with which it consciously competes, and shares its format of a cubical space surmounted by a dome, of gray pietra serena and whitewashed walls. It was the first essay in architecture (1519–24) of Michelangelo, who also designed its monuments that are dedicated to certain members of the Medici family, with sculptural figures of the four times of day that were destined to influence sculptural figures reclining on architraves for many generations to come. The Sagrestia Nuova was entered by a discreet entrance in a corner of San Lorenzo's right transept, now closed. Although it was vaulted over by 1524, the ambitious projects of its sculpture and the intervention of events, such as the temporary exile of the Medici (1527), the death of Giulio, eventually Pope Clement VII, and the permanent departure of Michelangelo for Rome in 1534, meant that Michelangelo never finished it. In 1976, a concealed corridor with drawings by Michelangelo on its walls was discovered under the New Sacristy. The Madonna and Child was the first sculpture Michelangelo completed for the project and although most of the following statues had been carved by the time of Michelangelo's departure, they had not been put in place, being left in disarray across the chapel. Later, in 1545, they were installed by Niccolò Tribolo. By order of Cosimo I, Giorgio Vasari and Bartolomeo Ammannati finished the work by 1555. Four Medici