The miracle associated with St. Cyril of Jerusalem was the appearance on May 7, 351, of a luminous cross in the sky over Golgotha (the site of Jesus’ Crucifixion) that extended to the Mount of Olives. The apparition was reportedly witnessed by the entire population of Jerusalem and was documented by Cyril in a letter to Emperor Constantius II. It was interpreted as a divine sign affirming orthodox Christianity against the Arian heresy (to which Constantinus had become sympathetic). The Greek Orthodox Church commemorates this event annually on May 7.
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