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Martyr of Caesarea, in Cappadocia, Asia Minor. He was the reported son of a Scythian officer of the Roman army and became a military hero when barbarians assaulted Rome. When Mercurius refused to take part in sacrifices to the pagan gods during the persecution launched by Emperor Trajanus Decius, he was sent to Caesarea and beheaded. Mercurius was reported to have lent his sword and skills in battles against evil. He supposedly aided St. George and St. Demetrius during the First Crusade and is counted traditionally as a warrior saint.
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