ECUMENICAL COUNCIL, FIRST SEVEN SESSIONS, LIST
List of ecumenical councils
First seven ecumenical councils
Main article: First seven ecumenical councils

Nicaea (İznik)

Constantinople (İstanbul)

Chalcedon (Kadıköy)
Locations of six of the first seven ecumenical councils (all convened in modern-day Turkey).
In the history of Christianity, the first seven ecumenical councils, from the First Council of Nicaea (325) to the Second Council of Nicaea (787), represent an attempt to reach an orthodox consensus and to unify Christendom.
All of the original seven ecumenical councils as recognized in whole or in part were called by an emperor of the Eastern Roman Empire and all were held in the Eastern Roman Empire,[12][13] a recognition denied to other councils similarly called by an Eastern Roman emperor and held in his territory, in particular the Council of Serdica (343), the Second Council of Ephesus (449) and the Council of Hieria (754), which saw themselves as ecumenical or were intended as such.
- The First Council of Nicaea (325) repudiated Arianism, declared that Christ is "homoousios with the Father" (of the same substance as the Father), and adopted the original Nicene Creed; addressed the Quartodeciman controversy by fixing the date of Easter;[20][21] recognised authority of the sees of Rome, Alexandria and Antioch outside their own civil provinces and granted the see of Jerusalem a position of honour.
- The First Council of Constantinople (381) repudiated Arianism and Macedonianism, declared that Christ is "born of the Father before all time", revised the Nicene Creed in regard to the Holy Spirit.
- The Council of Ephesus (431) repudiated Nestorianism, proclaimed the Virgin Mary as the Theotokos ("Birth-giver to God", "God-bearer", "Mother of God"), repudiated Pelagianism, and reaffirmed the Nicene Creed.
This and all the following councils in this list are not recognised by all of the Church of the East.
- The Second Council of Ephesus (449) received Eutyches as orthodox based on his petition outlining his confession of faith. Deposed Theodoret of Cyrrhus and Ibas of Edessa. Condemned Ibas's Letter to "Maris the Persian" (possibly a misunderstood title, indicating as the receiver a certain Catholicus Dadyeshu, bishop of Ardashir/Ctesiphon between 421-56;[22] this same letter later became one of the Three Chapters).
Though originally convened as an ecumenical council, this council is not recognised as ecumenical and is denounced as a Robber Council by the Chalcedonians (Catholics, Eastern Orthodox, Protestants).
- The Council of Chalcedon (451) repudiated the Eutychian doctrine of monophysitism; adopted the Chalcedonian Creed, which described the hypostatic union of the two natures of Christ, human and divine; reinstated those deposed in 449 including Theodoret of Cyrus. Restored Ibas of Edessa to his see and declared him innocent upon reading his letter. Deposed Dioscorus of Alexandria; and elevated the bishoprics of Constantinople and Jerusalem to the status of patriarchates. This is also the last council explicitly recognised by the Anglican Communion.
This council is rejected by Oriental Orthodox churches.
- The Third Council of Ephesus (475) ratified an encyclical of Emperor Basiliscus which repudiated the Council of Chalcedon and particularly the Tome of Leo.
This council is recognised only by Oriental Orthodox churches, but is not recognised by the Chalcedonians (Catholics, Eastern Orthodox, Protestants). All the following councils in this list are rejected or at least not explicitly affirmed by Oriental Orthodox churches.
- The Second Council of Constantinople (553) repudiated the Three Chapters as Nestorian, condemned Origenism, and decreed the theopaschite formula.
- The Third Council of Constantinople (680–681) repudiated monothelitism and monoenergism.
- The Quinisext Council, also called Council in Trullo (692)[23] addressed matters of discipline (in amendment to the 5th and 6th councils).
The ecumenical status of this council was repudiated by the Western churches.
- The Second Council of Nicaea (787) restored the veneration of icons (condemned at the Council of Hieria, 754) and repudiated iconoclasm.
