St. Mercury
Roman soldier and Christian martyr. Depicted on an image of Our Lady before which Basil prayed. In a vision, he appeared first dim then holding a bloodied spear, portending Julian the Apostate's death.
Preliminaries
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TO THE MOST REVEREND AND MOST ILLUSTRIOUS LORD HENRY FRANCIS VAN DER BURCH, ARCHBISHOP AND DUKE OF CAMBRAI, PRINCE OF THE HOLY ROMAN EMPIRE, COUNT OF CAMBRAI.
— Depicted on an image of Our Lady before which Basil prayed; in a vision, appeared first dim then holding a bloodied spear (portending Julian's death)
"on which also was depicted the figure of Mercury the celebrated martyr"