1583 - Council of Constantinople (Pan-Orthodox Synod), convened and presided over by Ecumenical Patriarch Jeremiah II, called the Illustrious, of Constantinople, and attended by Patriarchs Sylvester of Alexandria and Sophronius of Jerusalem and several other bishops, condemns those who uncanonically and heretically insert the filioque clause in the Nicene creed, thereby believing that the Holy Spirit proceeds essentially and hypostatically from both the Father and the Son, rather than essentially from the Father alone, and from the Father and Son together only in a temporal sense; those who do not administer both the body and blood in the Eucharist, bur rather only the body, claiming that it is sufficient, although Christ administered both kinds; those who administer the body in the form of unleavened bread, contrary to the gospels and ancient tradition; those who perform the mystery of holy baptism by sprinkling, rather than by triple immersion; those who believe that at the Second Coming the Lord will judge only bodies and not also souls, or embodied souls; that Christians who had failed to repent on earth go to a mythical purgatory where they are cleansed by fire before entering paradise, or that hell is not everlasting but only temporary, as in the teachings of Origen; that the Pope of Rome, rather than the Lord Jesus Christ, is the head of the Church, and supposedly has certain rights to admit people into paradise by way of indulgences, passports or licenses to sin; and those who trample upon the decrees of the First Ecumenical Council of Nicea by adopting the unorthodox Gregorian Paschalion and Menologion (i.e. the new calendar).

Its text can be found here.

1587 - Council of Constantinople (Pan-Orthodox Synod), convened and presided over by Ecumenical Patriarch Jeremiah II and attended by Patriarchs Sylvester of Alexandria, Joachim V of Antioch, Sophronius of Jerusalem and several bishops, condemns any attempt to adopt the new, papal, Gregorian calendar or to revise the Julian calendar.

1593 - Council of Constantinople (Pan-Orthodox Synod), convened by Russian Emperor Theodore I, presided over by Ecumenical Patriarch Jeremiah II, and attended by Patriarchs Meletius Pegas of Alexandria, Joachim VI of Antioch, Sophronius of Jerusalem, Job of Moscow and several bishops, condemns the use of the new, Gregorian calendar.