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1911 Encyclopedia Britannica
Pope from 259 to 268. To Dionysius, who was elected pope in 259 after the persecution of Valerian, fell the task of reorganizing the Roman church, which had fallen into great disorder. At the protest of some of the faithful at Alexandria, he demanded from the bishop of Alexandria, also called Dionysius, explanations touching his doctrine. He died on the 26th of December 268.
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Chisholm, Hugh, General Editor. Entry for 'Dionysius (Pope)'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/d/dionysius-pope.html. 1910.