HISTORY OF THE REFORMATION IN THE SIXTEENTH CENTURY Christianity—Two distinguishing Principles—Formation of the Papacy—First encroachments—Influence of Rome—Co-operation of Bishops and Factions—External Unity of the Church—Internal Unity of the Church—Primacy of St. Peter—Patriarchates—Co-operation of Princes—Influence of the Barbarians—Rome invokes the Franks—Secular Power—Pepin and Charlemagne—The Decretals—Disorders of Rome—The Emperor the
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