Malankara Orthodox Syrian Church in the context of "Saint Thomas Christians"

The Ethiopian Orthodox Tewahedo Church (Amharic: የኢትዮጵያ ኦርቶዶክስ ተዋሕዶ ቤተ ክርስቲያን, romanized: Yä-ityopp'ya ortodoks täwahədo betä krəstiyan) is the largest of the Oriental Orthodox Churches. One of the few Christian churches in Africa originating before European colonization of the continent, the Ethiopian Orthodox Tewahedo Church dates back to the Christianization of the Kingdom of Aksum in 330, and has between 38 million and 46 million adherents in Ethiopia. The Ethiopian Orthodox Tewahedo Church claims 60 million members worldwide. It is a founding member of the World Council of Churches. The Ethiopian Orthodox Tewahedo Church is in communion with the other Oriental Orthodox churches (the Eritrean Orthodox Tewahedo Church, the Coptic Orthodox Church of Alexandria, the Malankara Orthodox Syrian Church, the Armenian Apostolic Church, and the Syriac Orthodox Church).

The Ethiopian Orthodox Tewahedo Church had been administratively part of the Coptic Orthodox Church of Alexandria from the first half of the 4th century until 1959, when it was granted autocephaly with its own patriarch by Pope Cyril VI of Alexandria, Pope of the Coptic Orthodox Church.

The Words of Institution, also called the Words of Consecration, are words echoing those of Jesus himself at his Last Supper that, when consecrating bread and wine, Christian eucharistic liturgies include in a narrative of that event. Eucharistic scholars sometimes refer to them simply as the verba (Latin for "words").

Almost all existing ancient Christian churches explicitly include the Words of Institution in their eucharistic celebrations and consider them necessary for the validity of the sacrament. This is the practice of the Catholic Church's Latin liturgical rites and Eastern Catholic liturgies, the Eastern Orthodox Church, and all the Oriental Orthodox Churches, including the Armenian, the Coptic, the Ethiopian and the Malankara, as well as the Anglican Communion, Lutheran churches, Methodist churches, and Reformed churches. The only ancient eucharistic ritual still in use that does not explicitly contain the Words of Institution is the Holy Qurbana of Addai and Mari, used for part of the year by the Church of the East denominations, namely Assyrian Church of the East, Ancient Church of the East, and the Chaldean Syrian Church, due to their tradition of using the Holy Leaven. The Chaldean Catholic Church and the Syro-Malabar Church, two of the Eastern Catholic Churches, use the same Anaphora, but insert in it the Words of Institution. However, groups authorized by the Catholic Church to review the Qurbana recognized the validity of this eucharistic celebration in its original form, without explicit mention of the Words of Institution, saying that "the words of Eucharistic Institution are indeed present in the Anaphora of Addai and Mari, not in a coherent narrative way and ad litteram, but rather in a dispersed euchological way, that is, integrated in successive prayers of thanksgiving, praise and intercession."

The Liturgy of Saint James is a form of Christian liturgy used by some Eastern Christians of the Byzantine rite and West Syriac Rite. It is developed from an ancient Egyptian form of the Basilean anaphoric family, and is influenced by the traditions of the rite of the Church of Jerusalem, as the Mystagogic Catecheses of Cyril of Jerusalem imply. It became the primary Divine Liturgy in the Church of Antioch and Church of Jerusalem in the early fifth century, soon becoming supplanted by the liturgies of Saint Basil and Saint John Chrysostom. It is still the principal liturgy of the Syriac Orthodox Church, the Malankara Orthodox Syrian Church, the Maronite Church, the Syriac Catholic Church, Syro-Malankara Catholic Church and other churches employing the West Syriac Rite. It is also occasionally used in the Eastern Orthodox Church and Melkite Catholic Church. The Malankara Mar Thoma Syrian Church uses a reformed variant of this liturgy, omitting intercession of saints and prayer for the dead.

The liturgy is attributed with the name of James the Just and patriarch among the Jewish Christians at Jerusalem.

The mitre (Commonwealth English) or miter (American English; see spelling differences; both pronounced /ˈmaɪtər/ MY-tər; Greek: μίτρα, romanized: mítra, lit. 'headband') is a type of headgear now known as the traditional, ceremonial headdress of bishops and certain abbots in traditional Christianity. Mitres are worn in the Catholic Church, Malankara Orthodox Syrian Church (IOC), Malankara Syrian Orthodox Church (Jacobites), Eastern Orthodox Church, Oriental Orthodox Churches, the Anglican Communion, some Lutheran churches, for important ceremonies, by the Metropolitan of the Malankara Mar Thoma Syrian Church, and also, in the Catholic Church, all cardinals, whether or not bishops, and some Eastern Orthodox archpriests.

A catholicos (plural: catholicoi) is the head of certain churches in some Eastern Christian traditions. The title implies autocephaly and, in some cases, it is the title of the head of an autonomous church. The word comes from ancient Greek καθολικός (pl. καθολικοί), derived from καθ' ὅλου (kath'olou, "generally") from κατά (kata, "down") and ὅλος (holos, "whole"), meaning "concerning the whole, universal, general"; it originally designated a financial or civil office in the Roman Empire.

The Church of the East, some Oriental Orthodox, Eastern Orthodox, and Eastern Catholic churches historically use this title; for example the Armenian Apostolic Church and the Georgian Orthodox Church. In the Church of the East, the title was given to the church's head, the patriarch of the Church of the East; it is still used in two successor churches, the Assyrian Church of the East and the Ancient Church of the East, the heads of which are known as catholicos-patriarchs. In the Armenian Church there are two catholicoi: the supreme catholicos of Ejmiadzin and the catholicos of Cilicia. The title catholicos-patriarchs is also used by the primate of the Armenian Catholic Church. In India, an autocephalous Oriental Orthodox Church and the regional head of Jacobite Syrian Christian Church (an autonomous Church within Syriac Orthodox Church) use this title. The first is the catholicos of the East and Malankara Metropolitan, and the latter the catholicos of India, but unequally same according to the constitution of the Syriac Orthodox Church and the Jacobite Syrian Christian Church.

The Catholicos of All Armenians (Armenian: Ամենայն Հայոց Կաթողիկոս) is the chief bishop and spiritual leader of Armenia's national church, the Armenian Apostolic Church, and the worldwide Armenian diaspora. The Armenian Catholicos (plural Catholicoi) is also known as the Armenian Pontiff (Վեհափառ, Vehapar or Վեհափառ Հայրապետ, Vehapar Hayrapet) and by other titles. According to tradition, the apostles Saint Thaddeus and Saint Bartholomew brought Christianity to Armenia in the first century. Saint Gregory the Illuminator became the first Catholicos of All Armenians following the nation's adoption of Christianity as its state religion in 301 AD. The seat of the Catholicos, and the spiritual and administrative headquarters of the Armenian Church, is the Mother See of Holy Etchmiadzin, located in the city of Vagharshapat.

The Armenian Apostolic Church is part of the Oriental Orthodox communion. This communion includes the Coptic Orthodox Church of Alexandria, the Ethiopian Orthodox Tewahedo Church, the Syriac Orthodox Church, the Malankara Orthodox Syrian Church, and the Eritrean Orthodox Tewahedo Church.