St. Mary Major is one of the four Roman basilicas known as patriarchal cathedrals in memory of the first centers of the Church. St. John Lateran represents Rome, the See of Peter; St. Paul Outside the Walls, the See of Alexandria, allegedly the see presided over by Mark; St. Peters, the See of Constantinople; and St. Marys, the See of Antioch, where Mary is supposed to have spent most of her life.
One legend, unreported before the year 1000, gives another name to this feast: Our Lady of the Snows. According to that story, a wealthy Roman couple pledged their fortune to the Mother of God. In affirmation, she produced a miraculous summer snowfall and told them to build a church on the site. The legend was long celebrated by releasing a shower of white rose petals from the basilicas dome every August 5.