In several of the autocephalous Eastern Orthodox Churches and Eastern Catholic Churches, the patriarch or head bishop is elected by a group of bishops called the Holy Synod. For instance, the Holy Synod is a ruling body of the Georgian Orthodox Church.
In Oriental Orthodoxy the Holy Synod is the highest authority in the church and it formulates the rules and regulations regarding matters of church organization, faith, and order of service.
The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is one of the three major doctrinal and jurisdictional groups of Christianity. As of 2012, it has approximately 300 million adherents and is the third largest religious community in the world after Catholics and Sunni Muslims. The Eastern Orthodox Church operates as a communion of autocephalous churches, each governed by its bishops via local synods. The church has no central doctrinal or governmental authority analogous to the pope of the Catholic Church. Nevertheless, the Ecumenical Patriarch of Constantinople is recognised by them as primus inter pares ('first among equals'), a title held by the patriarch of Rome prior to 1054. As one of the oldest surviving religious institutions in the world, the Eastern Orthodox Church has played an especially prominent role in the history and culture of Eastern and Southeastern Europe. Since 2018, there has been an ongoing schism between Constantinople and Moscow, with the two not in full communion with each other.
Eastern Orthodox theology is based on the Scriptures and holy tradition, which incorporates the dogmatic decrees of the seven ecumenical councils, and the teaching of the Church Fathers. The church teaches that it is the one, holy, catholic and apostolic church established by Jesus Christ in his Great Commission, and that its bishops are the successors of Christ's apostles. It maintains that it practises the original Christian faith, as passed down by holy tradition. Its patriarchates, descending from the pentarchy, and other autocephalous and autonomous churches, reflect a variety of hierarchical organisation. It recognises seven major sacraments (which are called holy mysteries), of which the Eucharist is the principal one, celebrated liturgically in synaxis. The church teaches that through consecration invoked by a priest, the sacrificial bread and wine become the body and blood of Christ. The Virgin Mary is venerated in the Eastern Orthodox Church as the Theotokos, which means 'God-bearer', and she is honoured in devotions.
The Macedonian Orthodox Church – Archdiocese of Ohrid (MOC-AO; Macedonian: Македонска православна црква – Охридска архиепископија, МПЦ-ОА, romanized: Makedonska pravoslavna crkva – Ohridska arhiepiskopija, MPC-OA), or simply the Macedonian Orthodox Church (MOC) or the Archdiocese of Ohrid (AO), is an autocephalous Eastern Orthodox church in North Macedonia. The Macedonian Orthodox Church claims ecclesiastical jurisdiction over North Macedonia, and is also represented in the Macedonian diaspora. The primate of the Macedonian Orthodox Church is Stefan Veljanovski, the Metropolitan of Skopje and Archbishop of Ohrid and Macedonia.
In 1959, the Holy Synod of the Serbian Orthodox Church granted autonomy to the Macedonian Orthodox Church in the then-Socialist Republic of Macedonia, as the restoration of the historic Archbishopric of Ohrid; the MOC was united with the Serbian Orthodox Church (SOC) as a part of the SOC. In 1967, on the bicentennial anniversary of the abolition of the Archbishopric of Ohrid, the Macedonian Holy Synod unilaterally announced its autocephaly from the Serbian Orthodox Church. The Serbian synod denounced the decision and condemned the clergy as schismatic. Thenceforth, the Macedonian Church had remained unrecognised by all mainstream Eastern Orthodox churches for 55 years.
The Apostolic Autocephalous Orthodox Church of Georgia (Georgian: საქართველოს სამოციქულო ავტოკეფალური მართლმადიდებელი ეკლესია, romanized: sakartvelos samotsikulo avt'ok'epaluri martlmadidebeli ek'lesia), commonly known as the Georgian Orthodox Church or the Orthodox Church of Georgia, is an autocephalous Eastern Orthodox church in full communion with the other churches of Eastern Orthodoxy. It is Georgia's dominant religious institution, and a majority of Georgian people are members. The Orthodox Church of Georgia is one of the oldest churches in the world. It asserts apostolic foundation, and that its historical roots can be traced to the early and late Christianization of Iberia and Colchis by Andrew the Apostle in the 1st century AD and by Saint Nino in the 4th century AD, respectively. As in similar autocephalous Eastern Orthodox Christian churches, the church's highest governing body is the holy synod of bishops. The church is headed by the Patriarch of All Georgia, Ilia II, who was elected in 1977.
Eastern Orthodox Christianity was the state religion throughout most of Georgia's history until 1921, when the country, having declared independence from Russia in 1918, was occupied by the Red Army during the Soviet invasion of Georgia, becoming part of the Soviet Union. The current Constitution of Georgia recognizes the special role of the Georgian Orthodox Church in the country's history, but also stipulates the independence of the church from the state. Government relations are further defined and regulated by the Concordat of 2002.
A tomos (Greek: τόμος, romanized: tomos, lit. 'section', 'part of', 'part which is cut') in the Eastern Orthodox Church is a decree of the head of a particular Eastern Orthodox church on certain matters (such as the level of dependence of an autonomous church from its mother church).
Tomos is a Greek word; it can be literally translated as 'a section'. "In the narrower meaning in Orthodox church terminology, a tomos is [...] a scroll or a small book, but one with a very specific purpose — it codifies a decision by a Holy Synod, or council of Orthodox bishops." The translation of the word tomos in English is document.
The Holy Synod of Bishops of the Serbian Orthodox Church (Serbian: Свети архијерејски синод Српске православне цркве, romanized: Sveti arhijerejski sinod Srpske pravoslavne crkve) serves by Church constitution as the executive body of the Serbian Orthodox Church. The Holy Synod consists of five members: four bishops and the Patriarch who serves as the chairman.
The Syriac Orthodox Patriarch of Antioch and All the East (Syriac: ܦܛܪܝܪܟܐ ܕܐܢܛܝܘܟܝܐ ܘܕܟܠܗ̇ ܡܕܢܚܐ Paṭriarḵo ḏ-Anṭiuḵia waḏ-kuloh madnho) is the Bishop of Antioch, and head of the Syriac Orthodox Church (Syriac: ܥܺܕܬܳܐ ܣܽܘ̣ܪܝܳܝܬܳܐ ܬܪܺܝܨܰܬ ܫܽܘ̣ܒ̣ܚܳܐ). He presides over the Holy Synod of the Syriac Orthodox Church, which is its highest authority. The current Patriarch of Antioch is Ignatius Aphrem II, who was enthroned on 29 May 2014 as the 122nd Successor to Saint Peter.
The position of the Patriarch of Antioch was established and first held by Peter the Apostle (Syriac: ܫܹܡܥܘܿܢ ܟܹ݁ܐܦ݂ܵܐ Šemʿōn Kēp̄ā). He officially oversees the Holy Apostolic See at Antioch (modern-day Antakya, in Turkey), though the Patriarch currently resides in Damascus; the Patriarch fled to Syria during the 1915 Assyrian genocide.