Among the most intriguing aspects of late Byzantine intellectual and religious history is the phenomenon of Greek theologians who renounced the schism and advocated reunion with the Roman Church. The unionist movement reached its high point in the proceedings that resulted in the Council of Florence and its declaration of union between the Latin and Greek Churches in 1439. This article examines a key theological motif visible in the writings of Greek proponents of the Florentine Union, and John Plousiadenos (fl. 1460s) in particular: their identification of the Roman See and its bishop with prophetic power capable of overcoming earthly kings and disturbing terrestrial kingdoms. For unionists such as Plousiadenos, the Roman Church was not merely the “Mother See” and divinely appointed Head of Christendom, but a formidable Mistress that must be respected and obeyed at the threat of loss of power and liberty. For Plousiadenos, as well as other unionists who influenced him such as Basil Bessarion and George of Trebizond, the recent conquest of Constantinople by the Ottoman Turks stood as a warning for the rest of the Greek Christian world about the consequences of rejecting Roman authority. While elaborating this motif, this article also demonstrates that a narrative about Pope Alexander III allegedly humiliating the Emperor Frederick Barbarossa, which was previously thought to have been fabricated by Martin Luther or else by German humanists of the late-fifteenth and early-sixteenth centuries, was actually known in the middle of the fifteenth century by the Greek unionist John Plousiadenos.

Program

Charles Yost, Ph.D. “Petrine Prophecy as Power Discourse in the Thought of John Plousiadenos, ‘unionist priest’ (ἑνωτικός ἱερεύς)”

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Biography

Charles Yost is assistant professor of history at Hillsdale College. He received his Ph.D. from the Medieval Institute at the University of Notre Dame in 2019. Yost’s area of focus is the relations between the Latin and Byzantine Churches during the Middle Ages and, in particular, the role and thought of “unionists”—Byzantine theologians and churchmen who favored communion with the Roman Church. Along with Dr. Yury Avvakumov (University of Notre Dame), Yost is co-editor of the series Eastern Catholic Studies and Texts (Catholic University of America Press).

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