The Medici Chapels are two chapels built between the 16th and 17th centuries as an extension to the Basilica of San Lorenzo, in the Italian city of Florence. They are the Sagrestia Nuova, designed by Michelangelo, and the larger Cappella dei Principi, a collaboration between the Medici family and architects. The purpose of the chapels was to celebrate the Medici family, patrons of the church and Grand Dukes of Tuscany.