Pope Francis will join Rome’s celebrations this year of the fourth-century Marian miracle that inspired the construction of St. Mary Major Basilica.

Each year white rose petals fall from the ceiling of the papal Marian basilica in commemoration of a miraculous snowfall in Rome on Aug. 5 in the year 358 A.D.

The Vatican has announced that Pope Francis will witness this unique Roman tradition marking the anniversary of the “Miracle of the Snow” during vespers at St. Mary Major Basilica on the evening of Aug. 5.

According to tradition, the Virgin Mary appeared to both a nobleman named John and to Pope Liberius (352–366) in a dream foretelling the August snow and asking for a church to be built in her honor on the site of the snowfall. The church was rebuilt by Pope Sixtus III (432–440), after the Council of Ephesus in 431 declared Mary to be the mother of God.

The Basilica of St. Mary Major has a special significance for Pope Francis, who recently revealed that he wishes to be buried in this basilica and that a “place is already prepared.”

Pope Francis visited the Marian basilica on the first day of his pontificate to entrust his ministry to the Mother of God before the icon of Mary known as the “Salus Populi Romani,” or “Mary, Protector of the Roman People.”

The pope has returned to pray before the Marian icon each time he has departed for an international trip.

Among the four major papal basilicas in Rome, St. Mary Major is the only one that has maintained its original structure. Mosaics dating back to the fifth century can be seen in the central nave of the basilica, which also houses the relic of the holy crib from the birth of Christ.

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Rome will prepare for the anniversary of its papal Marian basilica with a triduum of prayer Aug. 2–4.

Celebrations on Aug. 5 will begin with a Mass at 10 a.m. presided over by Cardinal Stanislaw Rylko, the archpriest of the St. Mary Major. Monsignor Emilio Nappa, the president of the Pontifical Mission Societies, will close the festivities with another Mass at 7 p.m. 

To attend the vespers with Pope Francis at the basilica at 5:30 p.m., free tickets from the Vatican will need to be reserved in advance.