The Commemoration of the Holy Fathers of the First Six Ecumenical Councils.
In the Ninth Article of the Nicea-Constantinople Symbol of Faith proclaimed by the holy Fathers of the First and Second Ecumenical Councils, we confess our faith in “One, Holy, Catholic, and Apostolic Church.” By virtue of the catholic nature of the Church, an Ecumenical Council is the Church’s supreme authority, and possesses the competence to resolve major questions of church life. An Ecumenical Council is comprised of archpastors and pastors of the Church, and representatives of all the local Churches, from every land of the “oikumene” (i.e. from all the whole inhabited world).
The Orthodox Church acknowledges Seven Holy Ecumenical Councils:
The First Ecumenical Council (Nicea I) (May 29, and also on seventh Sunday after Pascha) was convened in the year 325 against the heresy of Arius, in the city of Nicea in Bithynia under St Constantine the Great, Equal of the Apostles.
The Second Ecumenical Council (Constantinople I) (May 22) was convened in the year 381 against the heresy of Macedonias, by the emperor Theodosius the Great.
The Third Ecumenical Council (Ephesus) (September 9) was convened in the year 431 against the heresy of Nestorius, in the city of Ephesus by the emperor Theodosius the Younger.
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