Celebrated in Piazza del Duomo at noon on the day of Pentecost, the 50th day following Easter, the feast of the Palombella commemorates the descent of the Holy Spirit upon the Madonna and the apostles in the cenacle. This secular tradition has been celebrated annually here since the end of the fourteenth century.
The Palombella was originally held inside the Cathedral until the Lateran Roman Council forbade the use of fireworks inside churches and places of worship, and the ceremony was transferred to the piazza outside the Duomo in 1846. A tabernacle in Gothic style with the figures of Mary and the Apostles was placed on the steps in front of the central portal of the Duomo, representing the cenacle.