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In church history, the term acephali has been applied to several sects that supposedly had no leader. E. Cobham Brewer wrote, in Dictionary of Phrase and Fable, that acephalites, "properly means men without a head." Jean Cooper wrote, in Dictionary of Christianity, that it characterizes "various schismatical Christian bodies". Among them were Nestorians who rejected the Council of Ephesus’ condemnation of Patriarch Nestorius of Constantinople, which deposed Nestorius and declared him a heretic.
The Council of Chalcedon was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia from 8 October to 1 November 451 AD. The council was attended by 520 bishops or their representatives, making it the largest and best-documented of the first seven ecumenical councils. The principal purpose of the council was to re-assert the teachings of the ecumenical Council of Ephesus against the heresies of Eutyches and Nestorius. Such heresies attempted to dismantle and separate Christ's divine nature from his humanity (Nestorianism) and further, to limit Christ as solely divine in nature (Monophysitism).
The Council of Ephesus was a council of Christian bishops convened in Ephesus in AD 431 by the Roman Emperor Theodosius II. This third ecumenical council, an effort to attain consensus in the church through an assembly representing all of Christendom, confirmed the original Nicene Creed, and condemned the teachings of Nestorius, Patriarch of Constantinople, who held that the Virgin Mary may be called the Christotokos, "Christ-bearer" but not the Theotokos, "God-bearer". It met in June and July 431 at the Church of Mary in Ephesus in Anatolia.
Nestorius was the Archbishop of Constantinople from 10 April 428 to August 431. A Christian theologian, several of his teachings in the fields of Christology and Mariology were seen as controversial and caused major disputes. He was condemned and deposed from his see by the Council of Ephesus, the third Ecumenical Council, in 431.
Eutyches was a presbyter and archimandrite at Constantinople. He first came to notice in 431 at the First Council of Ephesus, for his vehement opposition to the teachings of Nestorius; his condemnation of Nestorianism as heresy led him to an equally extreme, although opposite view, which precipitated his being denounced as a heretic himself.
Anatolius was a Patriarch of Constantinople. He is regarded as a saint, by both the Orthodox and Roman Catholic Churches.
Acacius was the Ecumenical Patriarch of Constantinople from 472 to 489. Acacius was practically the first prelate throughout the Eastern Orthodoxy and renowned for ambitious participation in the Chalcedonian controversy.
Macedonius II, patriarch of Constantinople (495–511). For an account of his election see Patriarch Euphemius of Constantinople
John II, surnamed Cappadox or the Cappadocian was Patriarch of Constantinople in 518–520, during the reign of Byzantine emperor Anastasius I after an enforced condemnation of the Council of Chalcedon. His short patriarchate is memorable for the celebrated Acclamations of Constantinople, and the reunion of East and West after a schism of 34 years. At the death of Timothy I, John of Cappadocia, whom he had designated his successor, was presbyter and chancellor of the Church of Constantinople.
Ibas was bishop of Edessa and was born in Syria. His name is the Syriac equivalent of "Donatus". He is frequently associated with the growth of Nestorianism, although this assertion is contentious and has been opposed.
Dioscorus I, also known as Dioscorus the Great, was the pope of Alexandria and patriarch of the See of St. Mark who was deposed by the Council of Chalcedon in 451. He was recognized as patriarch by the Coptic Church until his death. He died in Gangra, Paphlagonia, in September 454. He is venerated as a saint by the Coptic and other Oriental Orthodox Churches.
Domnus II, was Patriarch of Antioch between 442 and 449 and a friend of the influential Bishop of Cyrrhus, Saint Theodoret.
Eusebius of Dorylaeum was the 5th-century bishop of Dorylaeum, who spoke out against dissident teachings, especially those of Nestorius and Eutyches, during the period of Christological controversy. After succeeding in having them expelled from their positions, Eusebius was himself deposed and only reinstated two years later, after which the doctrine in dispute was more precisely defined.
Pentarchy is a model of Church organization formulated in the laws of Emperor Justinian I (527–565) of the Roman Empire. In this model, the Christian church is governed by the heads (patriarchs) of the five major episcopal sees of the Roman Empire: Rome, Constantinople, Alexandria, Antioch, and Jerusalem.
The Second Council of Ephesus was a Christological church synod in 449 AD convened by Emperor Theodosius II under the presidency of Pope Dioscorus I of Alexandria. It was intended to be an ecumenical council, and it is accepted as such by the miaphysite churches but was rejected by the Chalcedonian dyophysites. It was explicitly repudiated by the next council, the Council of Chalcedon of 451, recognised as the fourth ecumenical council by Chalcedonian Christians, and it was named the Latrocinium or "Robber Council" by Pope Leo I; the Chalcedonian churches, particularly the Roman Catholic and Eastern Orthodox communions, continue to accept this designation, while the Oriental Orthodox repudiate it.
Basil of Seleucia was a Bishop and ecclesiastical writer. He was archbishop of Seleucia ad Calycadnum by 448. He condemned Eutyches in the year 448, he "acquiesced" while "rehabilitating" at the Latrocinium in 449, "but recanted and signed" the Tome of Leo in 450.
In the history of Christianity, the first seven ecumenical councils include the following: the First Council of Nicaea in 325, the First Council of Constantinople in 381, the Council of Ephesus in 431, the Council of Chalcedon in 451, the Second Council of Constantinople in 553, the Third Council of Constantinople from 680–681 and finally, the Second Council of Nicaea in 787. All of the seven councils were convened in modern-day Turkey.
The Third Council of Ephesus was held in the Anatolian city of Ephesus in 475. It was presided over by Pope Timothy II of Alexandria, and also attended by Peter the Fuller, then Patriarch of Antioch, and Paul the Exarch of Ephesus. It ratified a recent Encyclical of Emperor Basiliscus, reportedly signed by 500-700 bishops throughout the Empire, which condemned the Council of Chalcedon and particularly the Tome of Leo. This council thus constitutes one of the most significant synodical condemnations of Chalcedon for the Oriental Orthodox. In response to the accusations of certain Chalcedonians that they, the Non-Chalcedonians, had adopted the erroneous teachings of Eutyches, the attendees of Ephesus III summarily anathematized all teachings which compromised the humanity of Christ, but without any explicit mention of Eutyches. Additionally, the council restored the complete autonomy of the Ecclesiastical Exarchate of Ephesus, which had been compromised at Chalcedon by ascribing authority to the Patriarch of Constantinople over Thrace, Pontus, and Asia.
In the 5th century in Christianity, there were many developments which led to further fracturing of the State church of the Roman Empire. Emperor Theodosius II called two synods in Ephesus, one in 431 and one in 449, that addressed the teachings of Patriarch of Constantinople Nestorius and similar teachings. Nestorius had taught that Christ's divine and human nature were distinct persons, and hence Mary was the mother of Christ but not the mother of God. The Council rejected Nestorius' view causing many churches, centered on the School of Edessa, to a Nestorian break with the imperial church. Persecuted within the Roman Empire, many Nestorians fled to Persia and joined the Sassanid Church thereby making it a center of Nestorianism. By the end of the 5th century, the global Christian population was estimated at 10-11 million. In 451 the Council of Chalcedon was held to clarify the issue further. The council ultimately stated that Christ's divine and human nature were separate but both part of a single entity, a viewpoint rejected by many churches who called themselves miaphysites. The resulting schism created a communion of churches, including the Armenian, Syrian, and Egyptian churches, that is today known as Oriental Orthodoxy. In spite of these schisms, however, the imperial church still came to represent the majority of Christians within the Roman Empire.
