In the back of the middle of the three apses is the altar of Saint Zanobius, first bishop of Florence. Its silver shrine, a masterpiece of Ghiberti, contains the urn with his relics. The central compartment shows us one of his miracles, the reviving of a dead child. Above this shrine is the painting "Last Supper" by the lesser-known Giovanni Balducci. There was also a glass-paste mosaic panel "The Bust of Saint Zanobius" by the 16th-century miniaturist Monte di Giovanni, but it is now on display in the Museum Opera del Duomo.