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Nicholas I, Patriarch of Constantinople: Letters
Nicholas I, Patriarch of Constantinople, R. J. H. Jenkins, L. G. Westerink

Next to Photius and Michael Cerularius, Nicholas I is probably the most prominent of the patriarchs of Constantinople. He is known, in the first place, as the central figure in the "tetragamy" affair—the conflict over Leo VI's fourth marriage, which divided the Church for nearly a century and resulted in Nicholas' (temporary) deposition; also as a major influence both in the domestic and in the foreign politics of the Eastern Empire throughout the first quarter of the tenth century. His correspondence with the Papal court and with Bulgarian, Caucasian, and Arab provinces, as well as with his own clergy, is a historical source of the first importance.