Chalcedonian Christianity in the context of "Anglican"

Eastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or "canonical") Eastern Orthodox Church is organised into autocephalous churches independent from each other. In the 21st century, the number of mainstream autocephalous churches is seventeen; there also exist autocephalous churches unrecognized by those mainstream ones. Autocephalous churches choose their own primate. Autocephalous churches can have jurisdiction (authority) over other churches, some of which have the status of "autonomous" which means they have more autonomy than simple eparchies.

Many of these jurisdictions correspond to the territories of one or more modern states; the Patriarchate of Moscow, for example, corresponds to Russia and some of the other post-Soviet states. They can also include metropolises, bishoprics, parishes, monasteries, or outlying metochia corresponding to diasporas that can also be located outside the country where the primate resides (e.g., the case of the Ecumenical Patriarchate of Constantinople whose canonical territory is located partly in northern Greece and the east); sometimes they overlap (the case of Moldova where the jurisdictions of the patriarchs of Bucharest and of Moscow overlap).

Western Aramaic is a group of Aramaic dialects once spoken widely throughout the ancient Levant, predominantly in the south, and Sinai, including ancient Damascus, Nabataea, across the Palestine region with Judea, Transjordan and Samaria, as well as today's Lebanon and the basins of the Orontes as far as Aleppo in the north. The group was divided into several regional variants, spoken mainly by the Palmyrenes in the east and the Aramaeans who settled on Mount Lebanon - ancestors of the early Maronites. In the south, it was spoken by Judeans (early Jews), Galileans, Samaritans, Pagans, Melkites (descendants of the aforementioned peoples who followed Chalcedonian Christianity), Nabataeans and possibly the Itureans. All of the Western Aramaic dialects are considered extinct today, except for the modern variety known as Western Neo-Aramaic. This dialect, which descends from Damascene Aramaic, is still spoken by the Arameans (Syriacs) in the towns of Maaloula, Bakh'a and Jubb'adin near Damascus, Syria.

Non-Chalcedonian Christianity comprises the branches of Christianity that do not accept and uphold theological resolutions of the Council of Chalcedon, the council following Ephesus, held in 451. Non-Chalcedonian denominations reject the Christological Definition of Chalcedon (which asserted Dyophysitism), for varying reasons. Non-Chalcedonian Christianity thus stands in contrast to Chalcedonian Christianity.

Today, the Oriental Orthodox Churches predominantly comprise most of non-Chalcedonian Christianity.

The First Council of Constantinople (Latin: Concilium Constantinopolitanum; Ancient Greek: Σύνοδος τῆς Κωνσταντινουπόλεως) was a council of Christian bishops convened in Constantinople (now Istanbul, Turkey) in AD 381 by the Roman Emperor Theodosius I. This second ecumenical council, an effort to attain consensus in the church through an assembly representing all of Christendom, except for the Western Church, confirmed the Nicene Creed, expanding the doctrine thereof to produce the Niceno-Constantinopolitan Creed, and dealt with sundry other matters. It met from May to July 381 in the Church of Hagia Irene and was affirmed as ecumenical in 451 at the Council of Chalcedon for Chalcedonian Christianity and the Second Council of Ephesus for the Oriental Orthodox Churches.

The Church of the East (Classical Syriac: ܥܕܬܐ ܕܡܕܢܚܐ ʿĒḏtā d-Maḏenḥā) or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church, the Chaldean Church or the Nestorian Church, is one of three major branches of Eastern Nicene Christianity that arose from the Christological controversies in the 5th century and the 6th century, alongside that of Miaphysitism (which came to be known as the Oriental Orthodox Churches) and Chalcedonian Christianity (from which Catholicism, Eastern Orthodoxy and Protestantism would arise).

Having its origins in Mesopotamia during the time of the Parthian Empire, the Church of the East developed its own unique form of Christian theology and liturgy. During the early modern period, a series of schisms gave rise to rival patriarchates, sometimes two, sometimes three. In the latter half of the 20th century, the traditionalist patriarchate of the church underwent a split into two rival patriarchates, namely the Assyrian Church of the East and the Ancient Church of the East, which continue to follow the traditional theology and liturgy of the mother church. The Chaldean Catholic Church based in Iraq and the Syro-Malabar Church in India are two Eastern Catholic churches which also claim the heritage of the Church of the East.

An ecumenical council, also called general council, is a meeting of bishops and other church authorities to consider and rule on questions of Christian doctrine, administration, discipline, and other matters in which those entitled to vote are convoked from the whole world (oikoumene) and which secures the approbation of the whole Church.

The word "ecumenical" derives from the Late Latin oecumenicus "general, universal", from Greek oikoumenikos "from the whole world", from he oikoumene ge "the inhabited world" (as known to the ancient Greeks); the Greeks and their neighbors, considered as developed human society (as opposed to barbarian lands); in later use "the Roman world" and in the Christian sense in ecclesiastical Greek, from oikoumenos, present passive participle of oikein ("inhabit"), from oikos ("house, habitation"). The first seven ecumenical councils, recognised by both the eastern and western denominations comprising Chalcedonian Christianity, were convoked by Roman Emperors, who also enforced the decisions of those councils within the state church of the Roman Empire.