Nestorian schismThe Nestorian schism (431) was a split between the Christian churches of Sassanid Persia, which affiliated with Nestorius, and those that later became the Catholic and Orthodox churches. The schism rose out of a Christological dispute, notably involving Cyril (Patriarch of Alexandria) and Nestorius (Patriarch of Constantinople). The First Council of Ephesus in 431 and the Council of Chalcedon in 451 condemned Nestorius and his doctrine, which emphasized the radical distinctness between Christ's human and divine natures.
School of NisibisThe School of Nisibis (ܐܣܟܘܠܐ ܕܢܨܝܒܝܢ, for a time absorbed into the School of Edessa) was an educational establishment in Nisibis (now Nusaybin, Turkey). It was an important spiritual centre of the early Church of the East, and like the Academy of Gondishapur, it is sometimes referred to as the world's first university. The school had three primary departments teaching: theology, philosophy and medicine. Its most famous teacher was Narsai, formerly head of the School of Edessa. The school was founded in 350 in Nisibis.
Babai the GreatBabai the Great (ܒܵܒܲܝ ܪܲܒܵܐ , c. 551 – 628) was an early church father of the Church of the East. He set several of the foundational pillars of the Church, revived the monastic movement, and formulated its Christology in a systematic way. He served as a monastic visitor and coadjutor with Mar Aba as unofficial heads of the Church of the East (often called the "Nestorian Church" by those in the West) after Catholicos Gregory until 628 AD, leaving a legacy of strong discipline and deep religious Orthodoxy.
NarsaiNarsai (sometimes spelt Narsay, Narseh or Narses; ܢܪܣܝ, Narsai, name derived from Pahlavi Narsēh from Avestan Nairyō.saȵhō, meaning 'potent utterance', the name of a yazata; 399-502) was one of the foremost of Assyrian poet-theologians, perhaps equal in stature to Jacob of Serugh, both second only to Mar Aprem of Nisibis. He is the most important writer of the East Syriac Christianity after Mar Aprem.
CatholicosA 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 ( () καθολικοί), derived from καθ' ὅλου (, "generally") from κατά (, "down") and ὅλος (, "whole"), meaning "concerning the whole, universal, general"; it originally designated a financial or civil office in the Roman Empire.
PeshittaThe Peshitta (ܦܫܺܝܛܬܳܐ or ܦܫܝܼܛܬܵܐ ) is the standard version of the Bible for churches in the Syriac tradition, including the Maronite Church, the Chaldean Catholic Church, the Syriac Catholic Church, the Syriac Orthodox Church, the Malabar Independent Syrian Church (Thozhiyoor Church), the Syro-Malankara Catholic Church, the Assyrian Church of the East and the Syro-Malabar Church.
SiirtSiirt (Siʿird; S'gherd; Siirt; Sêrt) is a city in the Siirt District of Siirt Province in Turkey. It had a population of 160,340 in 2021. The city is divided into the neighborhoods of Afetevlerı, Alan, Algul, Bahçelievler, Barış, Batı, Conkbayır, Çal, Doğan, Dumlupınar, Halenze, İnönü, Karakol, Kooperatif, Sakarya, Tınaztepe, Ulus, Ülkü, Veysel Karani and Yeni. Previously known as Saird, in pre-Islamic times Siirt was a diocese of the Eastern Orthodox Church (Sirte, Σίρτη in Byzantine Greek).
PentarchyPentarchy (from the Greek Πενταρχία, Pentarchía, from πέντε pénte, "five", and ἄρχειν archein, "to rule") 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.
Assyrian independence movementThe Assyrian independence movement is a political movement and ethno-nationalist desire of ethnic Assyrians to live in their indigenous Assyrian homeland in northern Mesopotamia under the self-governance of an Assyrian State. The tumultuous history of the traditional Assyrian homeland and surrounding regions, as well as the Partition of the Ottoman Empire, led to the emergence of modern Assyrian nationalism. To this respect, Assyrian independence movement is a "catch-all" term of the collective efforts of proponents of Assyrian nationalism in the context of the modern nation state.
SayfoThe Sayfo or the Seyfo (sword), also known as the Assyrian genocide, was the mass slaughter and deportation of Assyrian/Syriac Christians in southeastern Anatolia and Persia's Azerbaijan province by Ottoman forces and some Kurdish tribes during World War I. The Assyrians were divided into mutually antagonistic churches, including the Syriac Orthodox Church, the Church of the East, and the Chaldean Catholic Church. Before World War I, they lived in mountainous and remote areas of the Ottoman Empire (some of which were effectively stateless).
