Though significantly after Nicea, this sheds a bit of light (and answers a question or two I had) on the Coptic Church:
"When in AD 451 Emperor
Marcian attempted to heal divisions in the Church, the response of
Pope Dioscorus–the Pope of Alexandria who was later exiled–as that the emperor should not intervene in the affairs of the Church. It was at
Chalcedon that the emperor, through the imperial delegates, enforced harsh disciplinary measures against Pope Dioscorus in response to his boldness. In AD 449, Pope Dioscorus headed the 2nd Council of Ephesus, called the "
Robber Council" by Chalcedonian historians. It held to the
Miaphysite formula which upheld the Christology of "One Incarnate Nature of God the Word" (
Greek: μία φύσις Θεοῦ Λόγου σεσαρκωμένη (
mia physis Theou Logou sesarkōmenē)),
[17] and upheld the heretic
Eutyches claiming he was
orthodox.
The
Council of Chalcedon summoned Dioscorus three times to appear at the council, after which he was deposed. The Council of Chalcedon further deposed him for his support of Eutyches, but not necessarily for Eutychian
Monophysitism. Dioscorus appealed to the conciliar fathers to allow for a more
Miaphysite interpretation of Christology at the council, but was denied. Following his being deposed, the Coptic Church and its faithful felt unfairly underrepresented at the council and oppressed politically by the
Byzantine Empire. After the Byzantines appointed
Proterius of Alexandria as Patriarch to represent the
Chalcedonian Church, the Coptic Church appointed their own Patriarch
Timothy Aelurus and broke from the
State church of the Roman Empire.
The
Council of Chalcedon, from the perspective of the Alexandrine Christology, has deviated from the approved Cyrillian terminology and declared that Christ was one hypostasis in two natures. However, in the Nicene-Constantinopolitan Creed, "Christ was conceived of the Holy Spirit and of the Virgin Mary," thus the foundation of the definition according to the
Non-Chalcedonian adherents, according to the Christology of Cyril of Alexandria is valid. There is a change in the Non-Chalcedonian definition here, as the Nicene creed clearly uses the terms "of", rather than "in."[
citation needed]
In terms of Christology, the Oriental Orthodox (Non-Chalcedonians) understanding is that Christ is "One Nature—the Logos Incarnate,"
of the full humanity and full divinity. The Chalcedonians' understanding is that Christ is
recognized in two natures, full humanity and full divinity.
Oriental Orthodoxy contends that such a formulation is no different from what the
Nestorians teach.
[18] This is the doctrinal perception that makes the apparent difference which separated the Oriental Orthodox from the Eastern Orthodox.
The council's findings were rejected by many of the Christians on the fringes of the
Byzantine Empire, including Egyptians,
Syriacs,
Armenians, and others.
From that point onward, Alexandria would have two patriarchs: the non-Chalcedonian native Egyptian one, now known as the
Coptic Pope of Alexandria and Patriarch of All Africa on the Holy Apostolic See of St. Mark, and the
Melkite or Imperial Patriarch, now known as the
Greek Orthodox Patriarch of Alexandria.
[19]
Almost the entire Egyptian population rejected the terms of the Council of Chalcedon and remained faithful to the native Egyptian Church (now known as the Coptic Orthodox Church of Alexandria).
[20] Those who supported the Chalcedonian definition remained in
communion with the other leading imperial churches of
Rome and
Constantinople. The non-Chalcedonian party became what is today called the
Oriental Orthodox Church.
The Coptic Orthodox Church of Alexandria regards itself as having been misunderstood at the Council of Chalcedon. There was an opinion in the Church that viewed that perhaps the Council understood the Church of Alexandria correctly, but wanted to curtail the existing power of the Alexandrine Hierarch, especially after the events that happened several years before at Constantinople from
Pope Theophilus of Alexandria towards Patriarch
John Chrysostom and the unfortunate turnouts of the Second Council of Ephesus in AD 449, where Eutychus misled Pope Dioscorus and the Council in confessing the Orthodox Faith in writing and then renouncing it after the council, which in turn, had upset Rome, especially that the tome which was sent was not read during the council sessions.
To make things even worse, the Tome of Pope Leo of Rome was, according to the Alexandria School of Theology,[
citation needed] particularly in regards to the definition of Christology, considered influenced by Nestorian heretical teachings. So, due to the above-mentioned, especially in the consecutive sequences of events, the Hierarchs of Alexandria were considered holding too much of power from one hand, and on the other hand, due to the conflict of the Schools of Theology, there would be an impasse and a scapegoat, i.e. Pope Dioscorus. The Tome of Leo has been widely criticized (surprisingly by
Roman Catholic and
Eastern Orthodox scholars) in the past 50 years as a much less than perfect orthodox theological doctrine.[
citation needed] By anathematizing Pope Leo because of the tone and content of his tome, as per Alexandrine Theology perception, Pope Dioscorus was found guilty of doing so without due process; in other words, the Tome of Leo was not a subject of heresy in the first place, but it was a question of questioning the reasons behind not having it either acknowledged or read at the
Second Council of Ephesus in AD 449. Pope Dioscorus of Alexandria was never labeled as heretic by the council's canons. Copts also believe that the Pope of Alexandria was forcibly prevented from attending the third congregation of the council from which he was ousted, apparently the result of a conspiracy tailored by the Roman delegates.
[21]
Before the current positive era of Eastern and Oriental Orthodox dialogues, Chalcedonians sometimes used to call the non-Chalcedonians "
Monophysites", though the Coptic Orthodox Church in reality regards Monophysitism as a heresy. The Chalcedonian doctrine in turn came to be known as "
Dyophysite". A term that comes closer to Coptic Orthodoxy is
Miaphysite,
[22][23] which refers to a conjoined nature for Christ, both human and divine, united indivisibly in the Incarnate Logos. The Coptic Orthodox Church of Alexandria believes that Christ is perfect in his divinity, and he is perfect in his humanity, but his divinity and his humanity were united in one nature called "the nature of the incarnate word", which was reiterated by
Saint Cyril of Alexandria. Copts, thus, believe in two natures "human" and "divine" that are united in one hypostasis "without mingling, without confusion, and without alteration". These two natures "did not separate for a moment or the twinkling of an eye" (Coptic Liturgy of Saint Basil of Caesarea)." wiki:
Coptic Orthodox Church of Alexandria - Wikipedia
So depending once again what is meant in the original question regarding the intended meaning of "early Christians," as we get farther and farther away the puddle gets muddier and muddier.