The day was 5th of August so it was considered a miracle if it snowed. The miracle did happen and Santa Maria Maggiore was built.
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The basilica is also known as Basilica Liberiana after the founder, Santa Maria ad Praesepem (because the relics of the Infant Jesus’ cradle are treasured there), Santa Maria Maggiore (because it excels among all Roman basilicas consecrated to the Blessed Virgin) and Santa Maria della Neve, Our Lady of the Snow, after the miracle.