The annual event reenacts the Miracle of the Madonna of the Snow dating from the 350s when Pope Liberius dreamed that the Virgin Mary told him to build a church where snow fell. On the scorching night between August 4 and 5, according to the legend, snow fell on the Esquiline Hill. The basilica, one of the five in Rome belonging to the Vatican) was completed in 440.
Another version of the legend holds that a wealthy couple without heirs prayed to the Virgin for guidance on how to dispose of their property. Snow fell on that August 4-5 night, and the Virgin appeared to them in a vision, telling them to build a church where the snow had fallen. According to this legend, they built the basilica. We know them only as “a patrician named John and his wife.”
On August 5, during the celebration of two masses at Santa Maria Maggiore—in the morning and at vespers—white petals float from the dome onto the congregation. Originally these petals were from roses; today, they’re from dahlias. Beginning at 9 PM, a light show illuminates the exterior of the basilica. The festivities continue to midnight. Midway through the show, artificial snow falls on the crowd.
Last year, the truck delivering the snow equipment broke down en route and the event was postponed to Ferragosto (August 15—one of Italy’s premier holidays). Just thinking about the snow can cool you down on a sweltering August night.