mosaic of Christ between the Virgin and St Minias on its vaulted ceiling dating from 1297; the same subject is depicted on the façade of the church and is probably by the same unknown artist. The crucifix above the high altar is attributed to Luca della Robbia. The sacristy is decorated with a great fresco cycle on the Life of St Benedict by Spinello Aretino (1387). Cardinal of Portugal Chapel The Cappella del Cardinale del Portogallo to the left of the nave, "one of the most magnificent funerary monuments of the Italian Renaissance", was built in 1473 as a memorial to Cardinal James of Lusitania, who died in Florence, to which he was Portuguese ambassador, in 1459. It is the only tomb in the church. The chapel is a collaboration of outstanding artists of Florence: it was designed by Brunelleschi's associate, Antonio Manetti, and finished after his death by Antonio Rossellino. The tomb was made by Antonio and Bernardo Rossellino. The chapel decoration is by Alesso Baldovinetti, Antonio and Piero del Pollaiuolo, and Luca della Robbia. Exterior The geometrically patterned marble façade was probably begun in about 1090, although the upper parts date from the 12th century or later, financed by the Florentine Arte di Calimala (cloth merchants’ guild), who were responsible for the church's upkeep from 1288. The eagle which crowns the façade was their symbol. The campanile collapsed in 1499 and was replaced in 1523, although it was never finished. During the siege of Florence in 1530 it was used as an artillery post by the defenders and Michelangelo had it wrapped in mattresses to protect it from enemy fire. Church complex Adjacent to the church is the fine cloister, planned as early as 1426 and built from 1443 to mid-1450s. It was also designed by Bernardo and Antonio Rosselino, and financed by the Arte della Mercantia of Florence, and the fortified bishop's palace, built in 1295 and later used as a barracks and a hospital. The whole complex is surrounded by defensive walls, originally built hastily by Michelangelo during the siege and in 1553 expanded into a true fortress (fortezza) by Cosimo I de' Medici. The walls now enclose a large ornate monumental cemetery, the Porte Sante, laid out in 1854. Buried there are Carlo Collodi, creator of Pinocchio; politician Giovanni Spadolini; painter Pietro Annigoni; poet and author Luigi Ugolini; film producer Mario Cecchi Gori; sculptor Libero