Abstract

Despite the universal status of the Ferrara-Florentine Cathedral, the union of the Orthodox and Catholic Churches approved by him provoked ambiguous, but often very negative reactions. This is especially true of the Orthodox East, where the idea of ​​inter-church unification ages in a row was subjected to devastating criticism, and in cases of real attempts to introduce the union, there was a strong resistance from the individual zealots of the Byzantine Orthodoxy and their supporters. An exception to this rule was not the Orthodox Russia, the spiritual leader of which and the believer, and subsequently the researchers of various fields of humanitarian knowledge, did not reach a common view on the canonicality of the Ferrara-Florence Union, and thus the legal basis for its introduction.