An unusual number of meteor showers caused concern in Rome, and an inspection was made of the Sibylline Books, which discovered verses saying that if a foreigner were to make war on Italy, he could be defeated if the Magna Idaea, the Mother Goddess, associated with Mount Ida in Phrygia, were brought to Rome.
312: Maxentius consulted the Sibylline Books in preparation for combat with Constantine, who had recently switched his allegiance from Apollo to Christ.
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