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Stephen IV (or V) (born, Rome—died Jan. 24, 817, Rome) was the pope from June 816 to January 817. Of noble birth, he succeeded Pope St. Leo III in June 816. Immediately after his consecration he ordered the Romans to swear fidelity to the Carolingian emperor Louis I the Pious, whom he informed of his election and asked to meet in Gaul. Louis had been crowned by his father Charlemagne in 813. In Reims Stephen...