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The School of Nisibis was an educational establishment in Nisibis. 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.
Henana of Adiabene was a Christian theologian, and headmaster of the School of Nisibis, the main theological center of the Church of the East (571–610).
The Synod of Beth Lapat was a local council of the Church of the East, that was held in 484, in the Persian city of Gundeshapur. The council was headed by Metropolitan Barsauma of Nisibis, who was involved in a long conflict with Patriarch Babowai of Seleucia-Ctesiphon. No acts of this synod have been preserved, but fragmentary data from other sources suggest that various ecclesiological issues had been discussed, and that disciplinary canons against simony were adopted. Since Metropolitan Barsauma was involved in christological disputes, it is believed that several doctrinal questions were also discussed, and some later sources suggest that synod of 484 adopted a resolution in support of theological teachings of Theodore of Mopsuestia. Since no creeds or theological decisions of this council have been preserved, its outcome has been the subject of various assumptions among scholars.
Barsauma, nicknamed Bar Sawma, "son of Lent" in Syriac, was Metropolitan of Nisibis in the 5th century, and a major figure in the history of the Church of the East. Under his leadership the church moved away from Roman loyalties and became increasingly aligned with the Nestorian movement.
The Maphrian, originally known as the Grand Metropolitan of the East and also known as the Catholicos, was the second-highest rank in the ecclesiastical hierarchy of the Syriac Orthodox Church, right below that of patriarch. The office of a maphrian is an maphrianate. There have been three maphrianates in the history of the Syriac Orthodox Church and one, briefly, in the Syriac Catholic Church.
The Synod of Diamper (Udayamperoor Synod) (Malayalam: ഉദയംപേരൂർ സൂനഹദോസ്, romanized: Udayampērūṟ Sūnahadōs), held at Udayamperoor (known as Diamper in non-vernacular sources) in June 1599, was a diocesan synod, or council, that created rules and regulations for the ancient Saint Thomas Christians (also known as Mar Thoma Nasranis) of the Malabar Coast, a part of modern-day Kerala state, India, formally subjugating them and downgrading their whole Metropolitanate of India as the Diocese of Angamale, a suffragan see to the Archdiocese of Goa administered by Latin Church Padroado missionaries. This synod also introduced forced Liturgical Latinisation and the eschewal of local practices and beliefs, leading to a significant ecclesial protest by Saint Thomas Christians known as Coonan Cross Oath and a subsequent schism in the mid-17th century.
Aba I or Mar Abba the Great was the Patriarch of the Church of the East at Seleucia-Ctesiphon from 540 to 552. He introduced to the church the anaphoras of Theodore of Mopsuestia and Nestorius beside the more ancient liturgical rite of Addai and Mari. Though his tenure as catholicos saw Christians in the region threatened during the Persian-Roman wars and attempts by both Sassanid Persian and Byzantine rulers to interfere with the governance of the church, his reign is reckoned a period of consolidation, and a synod he held in 544 as instrumental in unifying and strengthening the church. In 544, the Synod of Mar Aba I adopted the ordinances of the Council of Chalcedon. He is thought to have written and translated a number of religious works. After his death in February 552, the faithful carried his casket from his simple home across the Tigris to the monastery of Mar Pithyon.
The Council of Seleucia-Ctesiphon, also called the Council of Mar Isaac, met in AD 410 in Seleucia-Ctesiphon, the capital of the Persian Sassanid Empire. Convoked by King Yazdegerd I (399–421), it organized the Christians of his empire into a single structured Church, which became known as the Church of the East. It is often compared to Constantine's Edict of Milan, approximately a century earlier. The events of this council are documented in the Synodicon Orientale.
The Metropolitanate of Maishan or Maysan was an East Syriac metropolitan province of the Church of the East between the fifth and thirteenth centuries. The historical region of Maishan or Maysan is situated in southern Iran. The metropolitans of Maishan sat at Prath d'Maishan, and for most of its history the province had three suffragan dioceses, at Karka d'Maishan, Rima and Nahargur. The last metropolitan of Maishan, the noted East Syriac author Shlemun (Solomon) of Basra, is attested in 1222, and it is not clear when the province ceased to exist.
The Church of the East or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church or the Nestorian Church, is one of three major branches of Nicene Eastern Christianity that arose from the Christological controversies of the 5th and 6th centuries, alongside the Miaphisite churches and the Chalcedonian Church.
The patriarch of the Church of the East is the patriarch, or leader and head bishop of the Church of the East. The position dates to the early centuries of Christianity within the Sassanid Empire, and the Church has been known by a variety of names, including the Church of the East, Nestorian Church, the Persian Church, the Sassanid Church, or East Syrian.
Gregory of Prat was patriarch of the Church of the East from 605 to 609. His name is included in the traditional list of patriarchs of the Church of the East.
Several historical evidences shed light on a significant Malankara–Persian ecclesiastical relationship that spanned centuries. While an ecclesiastical relationship existed between the Saint Thomas Christians of India and the Church in Sassanid Empire in the earlier centuries, closer ecclesiastical ties developed as early as seventh century, when India became an ecclesiastical province of the Church of the East, albeit restricted to matters of purely ecclesiastical nature such as ordination of priests, and not involved in matters of temporal administration. This relationship endured until the Portuguese protectorate of Cochin of Malabar came to be in 16th century, and the Portuguese discovery of a sea route to India. The Christians who came under the two ancient yet distinct lineages of Malankara and Persia had one factor in common: their Saint Thomas heritage. The Church of the East shared communion with the Great Church until the Council of Ephesus in the 5th century, separating primarily over differences in Christology.
Ahudemmeh was the Grand Metropolitan of the East in the Syriac Orthodox Church from 559 until his execution in 575. He was known as the Apostle of the Arabs, and is commemorated as a saint by the Syriac Orthodox Church.
Masʿūd Zazoyo or Masʿūd of Zaz was a Syriac Orthodox author, hermit, monk and prelate.
George of Arbela was an East Syriac churchman and author who served as the metropolitan of Mosul and Erbil (Arbela) from c. 960 until after 987.
The School of Seleucia-Ctesiphon was a theological school of the Church of the East located in the western half of the city of Seleucia-Ctesiphon on the right bank of the Tigris. It was an independent Christian school, not attached to any particular church or monastery.
Mar Shemʿon II was the patriarch of the Church of the East from c. 1385 until c. 1405. He succeeded Denha II, who died in 1381/2, and his reign corresponds to the beginning of a period of obscurity in the Church of the East and the patriarchal succession.
