The encyclical explicitly denounces the Filioque clause added by Rome to the Nicene Creed as a heresy, censures the papacy for missionizing among Eastern Orthodox Christians, and repudiates Ultramontanism (papal supremacy).
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In the course of all this, it notably makes reference to the Eighth Ecumenical Council (879-880), in contrast with the opinion of many modern Eastern Orthodox Christians that there are only seven Ecumenical Councils accepted by the Orthodox Church.
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