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The '''Encyclical of the Eastern Patriarchs''' was a letter sent in May, 1848 by the [[patriarch]]s of the [[Orthodox Church]] in reply to Pope Pius IX's ''Epistle to the Easterns'' (1848). Rather than being a private letter to Pius IX, it is addressed to "All the Bishops Everywhere, Beloved in the Holy Ghost, Our Venerable, Most Dear Brethren; and to their Most Pious Clergy; and to All the Genuine Orthodox Sons of the One, Holy, Catholic and Apostolic Church."

The encyclical explicitly denounces the [[Filioque|Filioque clause]] added by Rome to the [[Nicene-Constantinopolitan Creed]] as a [[heresy]], censures the [[papacy]] for missionizing among Orthodox Christians, and repudiates [[Ultramontanism]] (papal supremacy). It also describes the [[Roman Catholic Church]] as being in [[apostasy]], [[heresy]], and [[schism]].