Behind the Duomo di Siena, an imposing flight of stairs leads to the magnificent Battistero di San Giovanni, built between 1316 and 1325.
The interior, divided into three naves with ogival vaults, is completely frescoed and is one of the most representative examples of 15th-century Sienese painting.
The twelve scenes reproduced in the vaults by Lorenzo di Pietro - known as il Vecchietta - between 1447 and 1450, narrate the Articles of the Creed.
Standing out in the center is the Baptismal Font, an extraordinary work in marble, bronze, and enamel created between 1417 and 1431 by major sculptors of the time such as Giovanni di Turino, Lorenzo Ghiberti, Donatello, and Jacopo della Quercia.
The Font consists of a hexagonal basin into which are inserted the six gilded bronze mirrors depicting the life of the Baptist, punctuated by the statues of virtue: two of these, Faith and Hope, were made by Donatello.
The cycle ends with the famous relief also made by Donatello in 1427: the Feast of Herod.