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"), though proposed in the 16th century, was not begun until the early 17th century, its design being a collaboration between the family and architects.The octagonal Cappella dei Principi surmounted by a tall dome, 59 m. high, is the distinguishing feature of San Lorenzo when seen from a distance. It is on the same axis as the nave and chancel to which it provides the equivalent of an apsidal chapel. Its entrance is from the exterior the second main part of the Medici Chapel is called the 'Chapel of the Princes' (cappella dei principi).This chapel is very large and high-domed the chapel was built for belonged to the secondary line of the family, starting with Cosimo I, the first Grand Duke of Tuscany (as of 1569).This 'offshoot' branch of the family were much less modest than the original Medici of the 1300 and 1400's. Starting with Cosimo I, the family broke away from the old Medici custom of not showing one's wealth and instead became ostentatious and eager to flaunt their power final resting place of the Medici's in power from the 1500's onwards: Cosimo I, Cosimo II, Cosimo III, Ferdinand I, Francis I and Ferdinand II.