According to one tradition, Saint Basil once prayed before an icon on which Mercurius was portrayed as a soldier carrying a spear. He asked God not to permit the emperor Julian the Apostate (361-363) to return from his war against the Persians and resume his oppression of Christians. The image of the holy Great Martyr Mercurius depicted on the icon became invisible, only to reappear later with a bloodied spear.