The Basilica of San Lorenzo is considered a milestone in the development of Renaissance architecture. The basilica has a complicated building history. The project was begun around 1419, under the direction of Filippo Brunelleschi. Lack of funds slowed the construction and forced changes to the original design. By the early 1440s, only the sacristy (now called the Old Sacristy) had been worked on, as it was being paid for by the Medici.

In 1442, the Medici stepped in to take over financial responsibility of the church as well. After Brunelleschi’s death in 1446, the job was handed either to Antonio Manetti or Michelozzo; scholars are uncertain. Though the building was largely completed by 1459 in time for a visit to Florence by Pius II, the chapels along the right-hand aisles were still being built in the 1480s and 1490s.

Old Sacristy
Opening off the south transept is the square, domed space, the Sagrestia Vecchia, or Old Sacristy, that was designed by Brunelleschi and that is the oldest part of the present church and the only part completed in Brunelleschi’s lifetime; it contains the tombs of several members of the Medici family.

Sagrestia Vecchia
Opening off the south transept is the square, domed space, the Sagrestia Vecchia, or Old Sacristy, that was designed by Brunelleschi and that is the oldest part of the present church and the only part completed in Brunelleschi’s lifetime; it contains the tombs of several members of the Medici family. It was composed of a sphere on top of a cube; the cube acting as the human world and the sphere the heavens.