|Church of the East|
|Syriac: ? |
|Head||Catholicos-Patriarchs of the East|
|Region||Middle East, South India, Far East|
|Liturgy||East Syriac Rite|
(Liturgy of Addai and Mari)
|Founder||Thomas the Apostle, by its tradition|
|Origin||Apostolic Age, by its tradition|
Council of Seleucia-Ctesiphon (410)[note 2]
|Separations||Its schism of 1552 divided it into two patriarchates, later four, but by 1830 again two, one of which is now the Chaldean Catholic Church, while the other split further in 1968 into the Assyrian Church of the East and the Ancient Church of the East|
|Other name(s)||Nestorian Church, Persian Church, East Syrian Church|
The Church of the East (Syriac: ? t? d-Ma?en), also called the Persian Church or Nestorian Church,[note 3] was a Christian church of the East Syriac rite established c. 410. It was one of three major branches of Eastern Christianity that arose from the Christological controversies of the 5th and 6th centuries, alongside the Eastern Orthodox and Oriental Orthodox Churches. Since the Schism of 1552, there have been several different churches claiming the heritage of the Church of the East.
The Church of the East organized itself in 410 as the national church of the Sasanian Empire through the Council of Seleucia-Ctesiphon. In 424 it declared itself independent of the church structure of the Roman Empire. The Church of the East was headed by the Patriarch of the East seated in Seleucia-Ctesiphon, continuing a line that, according to its tradition, stretched back to the Apostolic Age. Its liturgical rite was the East Syrian Rite.
The Church of the East, which was part of the Great Church, shared communion with that within the Roman Empire until the Council of Ephesus in AD 431, separating primarily over differences in Christology. The Council of Ephesus condemned Nestorius (386-451), leading to the Nestorian Schism and a subsequent exodus of Nestorius' supporters to Sasanian Persia. The existing Christians in Persia welcomed these refugees and thus the Church of the East gradually adopted the doctrine of Nestorianism, emphasizing the distinctiveness of the divine and human natures of Jesus.
Continuing as a dhimmi community after the Muslim conquest of Persia (633–654), the Church of the East played a major role in the history of Christianity in Asia. Between the 9th and 14th centuries it represented the world's largest Christian denomination in terms of geographical extent. It established dioceses and communities stretching from the Mediterranean Sea and today's Iraq and Iran, to India (the Saint Thomas Christians), the Mongol kingdoms in Central Asia, and China during the Tang dynasty (7th to 9th centuries). In the 13th and 14th centuries the church experienced a final period of expansion under the Mongol Empire, where influential Nestorian Christians sat in the Mongol court.
The Church of the East declined rapidly starting in the 14th century in the aftermath of the fragmentation of the Mongol Empire. The rising Chinese and Islamic Mongol leaderships pushed out and nearly eradicated the Church of the East and its followers. Thereafter, Nestorian Christianity remained largely confined to Upper Mesopotamia and to the Saint Thomas Christians in Kerala, India.
Divisions occurred within the church itself, but by 1830 two unified patriarchates and distinct churches remained: the Assyrian Church of the East and the Chaldean Catholic Church (an Eastern Catholic Church in communion with the Holy See). The Ancient Church of the East split from the Assyrian Church of the East in 1968. In 2017, the Chaldean Catholic Church had approximately 628,405 members, the Assyrian Church of the East 323,300, while the Ancient Church of the East had 100,000.
The Church of the East's declaration in 424 of the independence of its head, the Patriarch of the East, preceded by nine years the 431 Council of Ephesus, which condemned Nestorius and declared that Mary, mother of Jesus, can be described as Mother of God. Two of the generally accepted ecumenical councils were held earlier: the First Council of Nicaea, in which a Persian bishop took part, in 325, and the First Council of Constantinople in 381. The Church of the East accepted the teaching of these two councils, but ignored the 431 Council and those that followed, seeing them as concerning only the patriarchates of the Roman Empire (Rome, Constantinople, Alexandria, Antioch, Jerusalem), all of which were for it "Western Christianity".
In the 6th century and thereafter, the Church of the East expanded greatly, establishing communities in India (the Saint Thomas Christians), among the Mongols in Central Asia, and in China, which became home to a thriving community under the Tang dynasty from the 7th to the 9th century. At its height, between the 9th and 14th centuries, the Church of the East was the world's largest Christian church in geographical extent, with dioceses stretching from its heartland in Upper Mesopotamia to the Mediterranean Sea and as far afield as China, Mongolia, Central Asia, Anatolia, the Arabian Peninsula and India.
From its peak of geographical extent, the church entered a period of rapid decline that began in the 14th century, due largely to outside influences. The Chinese Ming dynasty overthrew the Mongols (1368) and ejected Christians and other foreign influences from China, and many Mongols in Central Asia converted to Islam. The Muslim Turco-Mongol leader Timur (1336-1405) nearly eradicated the remaining Christians in the Middle East. Nestorian Christianity remained largely confined to communities in Upper Mesopotamia and the Malabar Coast of the Indian subcontinent.
In the early modern period, the schism of 1552 led to a series of internal divisions and ultimately to its branching into three separate churches: the Chaldean Catholic Church, in full communion with the Holy See, and the independent Assyrian Church of the East and Ancient Church of the East.
Nestorianism is a Christological doctrine that emphasises the distinction between the human and divine natures of Jesus. It was attributed to Nestorius, Patriarch of Constantinople from 428-431, whose doctrine represented the culmination of a philosophical current developed by scholars at the School of Antioch, most notably Nestorius's mentor Theodore of Mopsuestia, and stirred controversy when he publicly challenged the use of the title Theotokos (literally, "Bearer of God") for Mary, mother of Jesus, suggesting that the title denied Christ's full humanity. He argued that Jesus had two loosely joined natures, the divine Logos and the human Jesus, and proposed Christotokos (literally, "Bearer of the Christ") as a more suitable alternative title. His statements drew criticism from other prominent churchmen, particularly from Cyril, Patriarch of Alexandria, who had a leading part in the Council of Ephesus of 431, which condemned Nestorius for heresy and deposed him as Patriarch.
After 431, the state authorities in the Roman Empire suppressed Nestorianism, a reason for Christians under Persian rule to favour it and so allay suspicion that their loyalty lay with the hostile Christian-ruled empire.
It was in the aftermath of the slightly later Council of Chalcedon (451) that the Church of the East formulated a distinctive theology. The first such formulation was adopted at the Synod of Beth Lapat in 484. This was developed further in the early seventh century, when in an at first successful war against the Byzantine Empire the Sasanid Persian Empire incorporated broad territories populated by West Syrians, many of whom were supporters of the miaphysite theology of Oriental Orthodoxy which its opponents term "Monophysitism" (Eutychianism), the theological view most opposed to Nestorianism. These received support from Khosrow II, influenced by his wife Shirin. Drawing inspiration from Theodore of Mopsuestia, Babai the Great (551-628) expounded, especially in his Book of Union, what became the normative Christology of the Church of the East. He affirmed that the two qnome (individual natures) of Christ are unmixed but eternally united in his single parsopa (< prosopon "person"). As happened also with the Greek terms (physis) and (hypostasis), these Syriac words were sometimes taken to mean something other than what was intended; in particular "two qnome" was interpreted as "two individuals". Previously, the Church of the East accepted a certain fluidity of expressions, always within a dyophysite theology, but with Babai's assembly of 612, which canonically sanctioned the "two qnome in Christ" formula, a final christological distinction was created between the Church of the East and the "western" Chalcedonian Churches. 
The justice of imputing Nestorianism to Nestorius, whom the Church of the East venerated as a saint, is disputed. David Wilmshurst states that for centuries "the word 'Nestorian' was used both as a term of abuse by those who disapproved of the traditional East Syrian theology, as a term of pride by many of its defenders [...] and as a neutral and convenient descriptive term by others. Nowadays it is generally felt that the term carries a stigma". Sebastian P. Brock says: "The association between the Church of the East and Nestorius is of a very tenuous nature, and to continue to call that Church 'Nestorian' is, from a historical point of view, totally misleading and incorrect - quite apart from being highly offensive and a breach of ecumenical good manners."
In his 1996 article, "The 'Nestorian' Church: a lamentable misnomer", published in the Bulletin of the John Rylands Library, Sebastian Brock, a Fellow of the British Academy, lamented the fact that "the term 'Nestorian Church' has become the standard designation for the ancient oriental church which in the past called itself 'The Church of the East', but which today prefers a fuller title 'The Assyrian Church of the East'. Such a designation is not only discourteous to modern members of this venerable church, but also - as this paper aims to show - both inappropriate and misleading".
At the Council of Seleucia-Ctesiphon in 410, the Church of the East was declared to have at its head the bishop of the Persian capital Seleucia-Ctesiphon, who in the acts of the council was referred to as the Grand or Major Metropolitan, and who soon afterward was called the Catholicos of the East. Later, the title of Patriarch was used.
The Church of the East had, like other churches, an ordained clergy in the three traditional orders of bishop, priest (or presbyter), and deacon. Also like other churches, it had an episcopal polity: organisation by dioceses, each headed by a bishop and made up of several individual parish communities overseen by priests. Dioceses were organised into provinces under the authority of a metropolitan bishop. The office of metropolitan bishop was an important one, coming with additional duties and powers; canonically, only metropolitans could consecrate a patriarch. The Patriarch also has the charge of the Province of the Patriarch.
For most of its history the church had six or so Interior Provinces. In 410, these were listed in the hierarchical order of: Seleucia-Ctesiphon (central Iraq), Beth Lapat (western Iran), Nisibis (on the border between Turkey and Iraq), Prat de Maishan (Basra, southern Iraq), Arbela (Erbil, Turkestan region of Iraq), and Karka de Beth Slokh (Kirkuk, northeastern Iraq). In addition it had an increasing number of Exterior Provinces further afield within the Sasanian Empire and soon also beyond the empire's borders. By the 10th century, the church had between 20 and 30 metropolitan provinces According to John Foster, in the 9th century there were 25 metropolitans including in China and India. The Chinese provinces were lost in the 11th century, and in the subsequent centuries, other exterior provinces went into decline as well. However, in the 13th century, during the Mongol Empire, the church added two new metropolitan provinces in North China, Tangut and Katai and Ong.
The Peshitta, in some cases lightly revised and with missing books added, is the standard Syriac Bible for churches in the Syriac tradition: the Syriac Orthodox Church, the Syrian Catholic Church, the Assyrian Church of the East, the Ancient Church of the East, the Chaldean Catholic Church, the Maronites, the Malankara Orthodox Syrian Church, the Syro-Malabar Catholic Church and the Syro-Malankara Catholic Church.
The Old Testament of the Peshitta was translated from Hebrew, although the date and circumstances of this are not entirely clear. The translators may have been Syriac-speaking Jews or early Jewish converts to Christianity. The translation may have been done separately for different texts, and the whole work was probably done by the second century. Most of the deuterocanonical books of the Old Testament are found in the Syriac, and the Wisdom of Sirach is held to have been translated from the Hebrew and not from the Septuagint.
The New Testament of the Peshitta, which originally excluded certain disputed books (Second Epistle of Peter, Second Epistle of John, Third Epistle of John, Epistle of Jude, Book of Revelation), had become the standard by the early 5th century.
It was often said in the 19th century that the Church of the East was opposed to religious images of any kind. The cult of the image was never as strong in the Syriac Churches as it was in the Byzantine Church, but they were indeed present in the tradition of the Church of the East. Opposition to religious images eventually became the norm due to the rise of Islam in the region, which forbade any type of depictions of Saints and biblical prophets. As such, the Church was forced to get rid of icons.
There is both literary and archaeological evidence for the presence of images in the Church. Writing in 1248 from Samarkand, an Armenian official records visiting a local church and seeing an image of Christ and the Magi. John of Cora (Giovanni di Cori), Latin bishop of Sultaniya in Persia, writing about 1330 of the East Syrians in Khanbaliq says that they had 'very beautiful and orderly churches with crosses and images in honour of God and of the saints'. Apart from the references, there is a painting of a Nestorian Christian figure which was discovered by Aurel Stein at the Library Cave of the Mo-kao Caves in 1908, which is probably an image of Christ.
An illustrated 13th-century Nestorian Peshitta Gospel book written in Estrangela from northern Mesopotamia or Tur Abdin, currently in the State Library of Berlin, proves that in the 13th century the Church of the East was not yet aniconic. Another Nestorian Gospel manuscript preserved in the Bibliothèque nationale de France contains an illustration that depicts Jesus Christ in the circle of a ringed cross surrounded by four angels. Three Syriac manuscripts from early 19th century or earlier--they were published in a compilation titled The Book of Protection by Hermann Gollancz in 1912--contain some illustrations of no great artistic worth that show that use of images continued.
A life-size male stucco figure discovered in a late-6th-century church in Seleucia-Ctesiphon, beneath which were found the remains of an earlier church, also shows that the Church of the East used figurative representations.
Palm Sunday procession of Nestorian clergy in a 7th- or 8th-century wall painting from a Nestorian church in Tang China
The twelve apostles are gathered around Peter at Pentecost, from the Nestorian Peshitta Gospel.
Although the Nestorian community traced their history to the 1st century AD, the Church of the East first achieved official state recognition from the Sasanian Empire in the 4th century with the accession of Yazdegerd I (reigned 399-420) to the throne of the Sasanian Empire. In 410 the Synod of Seleucia-Ctesiphon, held at the Sasanian capital, allowed the Church's leading bishops to elect a formal Catholicos (leader). Catholicos Isaac was required both to lead the Assyrian Christian community and to answer on its behalf to the Sasanian emperor.
Under pressure from the Sasanian Emperor, the Church of the East sought to increasingly distance itself from the Greek Orthodox Church (at the time being known as the church of the Eastern Roman Empire). Therefore, in 424, the bishops of the Sasanian Empire met in council under the leadership of Catholicos Dadisho? (421-456) and determined that they would not, henceforth, refer disciplinary or theological problems to any external power, and especially not to any bishop or church council in the Roman Empire.
Thus, the Mesopotamian churches did not send representatives to the various church councils attended by representatives of the "Western Church". Accordingly, the leaders of the Church of the East did not feel bound by any decisions of what came to be regarded as Roman Imperial Councils. Despite this, the Creed and Canons of the First Council of Nicaea of 325, affirming the full divinity of Christ, were formally accepted at the Council of Seleucia-Ctesiphon in 410. The Church's understanding of the term hypostasis differs from the definition of the term offered at the Council of Chalcedon of 451. For this reason, the Assyrian Church has never approved the Chalcedonian definition.
The theological controversy that followed the Council of Ephesus in 431 proved a turning point in the Church's history. The Council condemned as heretical the Christology of Nestorius, whose reluctance to accord the Virgin Mary the title Theotokos "God-bearer, Mother of God" was taken as evidence that he believed two separate persons (as opposed to two united natures) to be present within Christ. (For the theological issues at stake, see Assyrian Church of the East and Nestorianism.)
The Sasanian Emperor, hostile to the Byzantines, saw the opportunity to ensure the loyalty of his Christian subjects and lent support to the Nestorian Schism. The Emperor took steps to cement the primacy of the Nestorian party within the Assyrian Church of the East, granting its members his protection, and executing the pro-Roman Catholicos Babowai in 484, replacing him with the Nestorian Bishop of Nisibis, Barsauma. The Catholicos-Patriarch Babai (497-503) confirmed the association of the Assyrian Church with Nestorianism.
Christians were already forming communities in Mesopotamia as early as the 1st century under the Parthian Empire. In 266, the area was annexed by the Sasanian Empire (becoming the province of As?rist?n), and there were significant Christian communities in Upper Mesopotamia, Elam, and Fars. The Church of the East traced its origins ultimately to the evangelical activity of Thaddeus of Edessa, Mari and Thomas the Apostle. Leadership and structure remained disorganised until 315 when Papa bar Aggai (310-329), bishop of Seleucia-Ctesiphon, imposed the primacy of his see over the other Mesopotamian and Persian bishoprics which were grouped together under the Catholicate of Seleucia-Ctesiphon; Papa took the title of Catholicos of the East, or universal leader. This position received an additional title in 410, becoming Catholicos and Patriarch of the East.
These early Christian communities in Mesopotamia, Elam, and Fars were reinforced in the 4th and 5th centuries by large-scale deportations of Christians from the eastern Roman Empire. However, the Persian Church faced several severe persecutions, notably during the reign of Shapur II (339-79), from the Zoroastrian majority who accused it of Roman leanings. Shapur II attempted to dismantle the catholicate's structure and put to death some of the clergy including the catholicoi Simeon bar Sabba'e (341),Shahdost (342), and Barba'shmin (346). Afterward, the office of Catholicos lay vacant nearly 20 years (346-363). In 363, under the terms of a peace treaty, Nisibis was ceded to the Persians, causing Ephrem the Syrian, accompanied by a number of teachers, to leave the School of Nisibis for Edessa still in Roman territory. The church grew considerably during the Sasanian period, but the pressure of persecution led the Catholicos Dadisho I in 424 to convene the Synod of Markabta at Seleucia and declare the Catholicate independent from "the western Fathers".
Meanwhile, in the Roman Empire, the Nestorian Schism had led many of Nestorius' supporters to relocate to the Sasanian Empire, mainly around the theological School of Nisibis. The Persian Church increasingly aligned itself with the Nestorians, a measure encouraged by the Zoroastrian ruling class. The church became increasingly Nestorian in doctrine over the next decades, furthering the divide between Roman and Nestorian Christianity. In 484 the Metropolitan of Nisibis, Barsauma, convened the Synod of Beth Lapat where he publicly accepted Nestorius' mentor, Theodore of Mopsuestia, as a spiritual authority. In 489, when the School of Edessa in Mesopotamia was closed by Byzantine Emperor Zeno for its Nestorian teachings, the school relocated to its original home of Nisibis, becoming again the School of Nisibis, leading to a wave of Nestorian immigration into the Sasanian Empire. The Patriarch of the East Mar Babai I (497-502) reiterated and expanded upon his predecessors' esteem for Theodore, solidifying the church's adoption of Nestorianism.
Now firmly established in the Persian Empire, with centres in Nisibis, Ctesiphon, and Gundeshapur, and several metropolitan sees, the Church of the East began to branch out beyond the Sasanian Empire. However, through the 6th century the church was frequently beset with internal strife and persecution from the Zoroastrians. The infighting led to a schism, which lasted from 521 until around 539, when the issues were resolved. However, immediately afterward Byzantine-Persian conflict led to a renewed persecution of the church by the Sasanian emperor Khosrau I; this ended in 545. The church survived these trials under the guidance of Patriarch Aba I, who had converted to Christianity from Zoroastrianism.
By the end of the 5th century and the middle of the 6th, the area occupied by the Church of the East included "all the countries to the east and those immediately to the west of the Euphrates", including the Sasanian Empire, the Arabian Peninsula, Socotra, Mesopotamia, Media, Bactria, Hyrcania, and India; and possibly also to places called Calliana, Male, and Sielediva (Ceylon). Beneath the Patriarch in the hierarchy were nine metropolitans, and clergy were recorded among the Huns, in Persarmenia, Media, and the island of Dioscoris in the Indian Ocean.
After the Sasanian Empire was conquered by Muslim Arabs in 644, the newly established Rashidun Caliphate designated the Church of the East as an official dhimmi minority group headed by the Patriarch of the East. As with all other Christian and Jewish groups given the same status, the Church was restricted within the Caliphate, but also given a degree of protection. Nestorians were not permitted to proselytise or attempt to convert Muslims, but their missionaries were otherwise given a free hand, and they increased missionary efforts farther afield. Missionaries established dioceses in India (the Saint Thomas Christians). They made some advances in Egypt, despite the strong Monophysite presence there, and they entered Central Asia, where they had significant success converting local Tartars. Nestorian missionaries were firmly established in China during the early part of the Tang dynasty (618-907); the Chinese source known as the Nestorian Stele describes a mission under a proselyte named Alopen as introducing Nestorian Christianity to China in 635. In the 7th century, the Church had grown to have two Nestorian archbishops, and over 20 bishops east of the Iranian border of the Oxus River.
Patriarch Timothy I (780-823), a contemporary of the Caliph Harun al-Rashid, took a particularly keen interest in the missionary expansion of the Church of the East. He is known to have consecrated metropolitans for Damascus, for Armenia, for Dailam and Gilan in Azerbaijan, for Rai in Tabaristan, for Sarbaz in Segestan, for the Turks of Central Asia, for China, and possibly also for Tibet. He also detached India from the metropolitan province of Fars and made it a separate metropolitan province, known as India. By the 10th century the Church of the East had a number of dioceses stretching from across the Caliphate's territories to India and China.
Nestorian Christians made substantial contributions to the Islamic Umayyad and Abbasid Caliphates, particularly in translating the works of the ancient Greek philosophers to Syriac and Arabic. Nestorians made their own contributions to philosophy, science (such as Hunayn ibn Ishaq, Qusta ibn Luqa, Masawaiyh, Patriarch Eutychius, Jabril ibn Bukhtishu) and theology (such as Tatian, Bar Daisan, Babai the Great, Nestorius, Toma bar Yacoub). The personal physicians of the Abbasid Caliphs were often Assyrian Christians such as the long serving Bukhtishu dynasty.
After the split with the Western World and synthesis with Nestorianism, the Church of the East expanded rapidly due to missionary works during the medieval period. During the period between 500 and 1400 the geographical horizon of the Church of the East extended well beyond its heartland in present-day northern Iraq, north eastern Syria and south eastern Turkey. Communities sprang up throughout Central Asia, and missionaries from Assyria and Mesopotamia took the Christian faith as far as China, with a primary indicator of their missionary work being the Nestorian Stele, a Christian tablet written in Chinese script found in China dating to 781 AD. Their most important conversion, however, was of the Saint Thomas Christians of the Malabar Coast in India, who alone escaped the destruction of the church by Timur at the end of the 14th century, and the majority of whom today constitute the largest group who now use the liturgy of the Church of the East, with around 4 million followers in their homeland, in spite of the 17th-century defection to the West Syriac Rite of the Syriac Orthodox Church. The St Thomas Christians were believed by tradition to have been converted by St Thomas, and were in communion with the Church of the East until the end of the medieval period.
The Saint Thomas Christian community of Kerala, India, who according to tradition trace their origins to the evangelizing efforts of Thomas the Apostle, had a long association with the Church of the East. The earliest known organised Christian presence in Kerala dates to 295/300 when Nestorian Christian settlers and missionaries from Persia headed by Bishop David of Basra settled in the region. The Saint Thomas Christians traditionally credit the mission of Thomas of Cana, a Nestorian from the Middle East, with the further expansion of their community. From at least the early 4th century, the Patriarch of the Church of the East provided the Saint Thomas Christians with clergy, holy texts, and ecclesiastical infrastructure. And around 650 Patriarch Ishoyahb III solidified the church's jurisdiction in India. In the 8th century Patriarch Timothy I organised the community as the Ecclesiastical Province of India, one of the Church's Provinces of the Exterior. After this point the Province of India was headed by a metropolitan bishop, provided from Persia, who oversaw a varying number of bishops as well as a native Archdeacon, who had authority over the clergy and also wielded a great amount of secular power. The metropolitan see was probably in Cranganore, or (perhaps nominally) in Mylapore, where the Shrine of Thomas was located.
In the 12th century Indian Nestorianism engaged the Western imagination in the figure of Prester John, supposedly a Nestorian ruler of India who held the offices of both king and priest. The geographically remote Malabar Church survived the decay of the Nestorian hierarchy elsewhere, enduring until the 16th century when the Portuguese arrived in India. The Portuguese at first accepted the Nestorian sect, but by the end of the century they had determined to actively bring the Saint Thomas Christians into full communion with Rome under the Latin Rite. They installed Portuguese bishops over the local sees and made liturgical changes to accord with the Latin practice. In 1599 the Synod of Diamper, overseen by Aleixo de Menezes, Archbishop of Goa, led to a revolt among the Saint Thomas Christians. The majority of them broke with the Catholic Church and vowed never to submit to the Portuguese in the Coonan Cross Oath of 1653. In 1661 Pope Alexander VII responded by sending a delegation of Carmelites headed by Chaldean Catholics to re-establish the East Syriac rites under an Eastern Catholic hierarchy. By the next year, 84 of the 116 communities had returned, forming the Syro-Malabar Catholic Church. The rest, which became known as the Malankara Church, soon entered into communion with the Syriac Orthodox Church. The Malankara Church also produced the Syro-Malankara Catholic Church.
Christianity reached China by 635, and its relics can still be seen in Chinese cities such as Xi'an. The Nestorian Stele, set up on 7 January 781 at the then-capital of Chang'an, attributes the introduction of Christianity to a mission under a Persian cleric named Alopen in 635, in the reign of Emperor Taizong of Tang during the Tang dynasty. The inscription on the Nestorian Stele, whose dating formula mentions the patriarch Hnanisho? II (773-80), gives the names of several prominent Christians in China, including Metropolitan Adam, Bishop Yohannan, 'country-bishops' Yazdbuzid and Sargis and Archdeacons Gigoi of Khumdan (Chang'an) and Gabriel of Sarag (Loyang). The names of around seventy monks are also listed.
Nestorian Christianity thrived in China for approximately 200 years, but then faced persecution from Emperor Wuzong of Tang (reigned 840-846). He suppressed all foreign religions, including Buddhism and Christianity, causing the Church to decline sharply in China. A Syrian monk visiting China a few decades later described many churches in ruin. The church disappeared from China in the early 10th century, coinciding with the collapse of the Tang dynasty and the tumult of the next years (the Five Dynasties and Ten Kingdoms period).
Christianity in China experienced a significant revival during the Mongol-created Yuan dynasty, established after the Mongols had conquered China in the 13th century. Marco Polo in the 13th century and other medieval Western writers described many Nestorian communities remaining in China and Mongolia; however, they clearly were not as vibrant as they had been during Tang times.
The Church of the East enjoyed a final period of expansion under the Mongols. Several Mongol tribes had already been converted by Nestorian missionaries in the 7th century, and Christianity was therefore a major influence in the Mongol Empire.Genghis Khan was a shamanist, but his sons took Christian wives from the powerful Kerait clan, as did their sons in turn. During the rule of Genghis's grandson, the Great Khan Mongke, Nestorian Christianity was the primary religious influence in the Empire, and this also carried over to Mongol-controlled China, during the Yuan Dynasty. It was at this point, in the late 13th century, that the Church of the East reached its greatest geographical reach. But Mongol power was already waning as the Empire dissolved into civil war; and it reached a turning point in 1295, when Ghazan, the Mongol ruler of the Ilkhanate, made a formal conversion to Islam when he took the throne.
Rabban Bar Sauma had initially conceived of his journey to the West as a pilgrimage to Jerusalem, so it is possible that there was a Nestorian presence in the city ca.1300. There was certainly a recognisable Nestorian presence at the Holy Sepulchre from the years 1348 through 1575, as contemporary Franciscan accounts indicate. At Famagusta, Cyprus, a Nestorian community was established just before 1300, and a church was built for them ca.1339.
The expansion was followed by a decline. There were 68 cities with resident Church of the East bishops in the year 1000; in 1238 there were only 24, and at the death of Timur in 1405, only seven. The result of some 20 years under Öljaitü, ruler of the Ilkhanate from 1304 to 1316, and to a lesser extent under his predecessor, was that "the church hierarchy had been crushed and most Church of the East buildings had been reduced to rubble".
When Timur, the Turco-Mongol leader of the Timurid Empire, known also as Tamerlane, came to power in 1370, he set out to cleanse his dominions of non-Muslims. He annihilated Christianity in central Asia. The Church of the East "lived on only in the mountains of Kurdistan and in India". Thus, except for the Saint Thomas Christians on the Malabar Coast, the Church of the East was confined to the area in and around the rough triangle formed by Mosul and Lakes Van and Urmia, including Amid (modern Diyarbak?r), Mêrdîn (modern Mardin) and Edessa to the west, Salmas to the east, Hakkari and Harran to the north, and Mosul, Kirkuk, and Arbela (modern Erbil) to the south - a region comprising, in modern maps, northern Iraq, southeast Turkey, northeast Syria and the northwestern fringe of Iran. Small Nestorian communities were located further west, notably in Jerusalem and Cyprus, but the Malabar Christians of India represented the only significant survival of the once-thriving exterior provinces of the Church of the East.
The complete disappearance of the Nestorian dioceses in Central Asia probably stemmed from a combination of persecution, disease, and isolation: "what survived the Mongols did not survive the Black Death of the fourteenth century." In many parts of Central Asia, Christianity had died out decades before Timur's campaigns. The surviving evidence from Central Asia, including a large number of dated graves, indicates that the crisis for the Church of the East occurred in the 1340s rather than the 1390s. Several contemporary observers, including the Papal Envoy Giovanni de' Marignolli, mention the murder of a Latin bishop in 1339 or 1340 by a Muslim mob in Almaliq, the chief city of Tangut, and the forcible conversion of the city's Christians to Islam. Tombstones in two East Syriac cemeteries in Mongolia have been dated from 1342, some commemorating deaths during a Black Death outbreak in 1338. In China, the last references to Nestorian and Latin Christians date from the 1350s, shortly before the replacement in 1368 of the Mongol Yuan dynasty with the xenophobic Ming dynasty and the consequent cutting off of China from the West.
From the middle of the 16th century, and throughout following two centuries, the Church of the East was affected by several internal schisms. Some of those schisms were caused by individuals or groups who chose to accept union with the Catholic Church. Other schisms were provoked by rivalry between various fractions within the Church of the East. Lack of internal unity and frequent change of allegiances led to the creation and continuation of separate patriarchal lines. In spite of many internal challenges, and external difficulties (political oppression by Ottoman authorities and frequent persecutions by local non-Christians), the traditional branches of the Church of the East managed to survive that tumultuous period and eventually consolidate during the 19th century in the form of the Assyrian Church of the East. At the same time, after many similar difficulties, groups united with the Catholic Church were finally consolidated into the Chaldean Catholic Church
Around the middle of the fifteenth century Patriarch Shem?on IV Basidi made the patriarchal succession hereditary – normally from uncle to nephew. This practice, which resulted in a shortage of eligible heirs, eventually led to a schism in the Church of the East, creating a temporarily Catholic offshoot known as the Shimun line. The Patriarch Shem?on VII Isho?yahb (1539-58) caused great turmoil at the beginning of his reign by designating his twelve-year-old nephew Khnanisho? as his successor, presumably because no older relatives were available. Several years later, probably because Khnanisho? had died in the interim, he designated as successor his fifteen-year-old brother Eliya, the future Patriarch Eliya (VI) VII (1558-91). These appointments, combined with other accusations of impropriety, caused discontent throughout the church, and by 1552 Shem?on VII Isho?yahb had become so unpopular that a group of bishops, principally from the Amid, Sirt and Salmas districts in northern Mesopotamia, chose a new patriarch. They elected a monk named Yohannan Sulaqa, the former superior of Rabban Hormizd Monastery near the Assyrian town of Alqosh, which was the seat of the incumbent patriarchs; however, no bishop of metropolitan rank was available to consecrate him, as canonically required. Franciscan missionaries were already at work among the Nestorians, and, using them as intermediaries, Sulaqa's supporters sought to legitimise their position by seeking their candidate's consecration by Pope Julius III (1550-5).
Sulaqa went to Rome, arriving on 18 November 1552, and presented a letter, drafted by his supporters in Mosul, setting out his claim and asking that the Pope consecrate him as Patriarch. On 15 February 1553 he made a twice-revised profession of faith judged to be satisfactory, and by the bull Divina Disponente Clementia of 20 February 1553 was appointed "Patriarch of Mosul in Eastern Syria" or "Patriarch of the Church of the Chaldeans of Mosul". He was consecrated bishop in St. Peter's Basilica on 9 April. On 28 April Pope Julius III gave him the pallium conferring patriarchal rank, confirmed with the bull Cum Nos Nuper. These events, in which Rome was led to believe that Shem?on VII Isho?yahb was dead, created within the Church of the East a lasting schism between the Eliya line of Patriarchs at Alqosh and the new line originating from Sulaqa. The latter was for half a century recognised by Rome as being in communion, but that reverted to both hereditary succession and Nestorianism and has continued in the Patriarchs of the Assyrian Church of the East.
Sulaqa left Rome in early July and in Constantinople applied for civil recognition. After his return to Mesopotamia, he received from the Ottoman authorities in December 1553 recognition as head of "the Chaldean nation after the example of all the Patriarchs". In the following year, during a five-month stay in Amid (Diyarbak?r), he consecrated two metropolitans and three other bishops(for Gazarta, Hesna d'Kifa, Amid, Mardin and Seert). For his part, Shem?on VII Isho?yahb of the Alqosh line consecrated two more underage members of his patriarchal family as metropolitans (for Nisibis and Gazarta). He also won over the governor of ?Amadiya, who invited Sulaqa to ?Amadiya, imprisoned him for four months, and put him to death in January 1555.
This new Catholic line founded by Sulaqa maintained its seat at Amid and is known as the "Shimun" line. Wilmshurst suggests that their adoption of the name Shimun (after Simon Peter) was meant to point to the legitimacy of their Catholic line. Sulaqa's successor, Abdisho IV Maron (1555–1570) visited Rome and his Patriarchal title was confirmed by the Pope in 1562. At some point, he moved to Seert.
The Eliya Patriarch Shemon VII Ishoyahb (1539-58), who resided in the Rabban Hormizd Monastery near Alqosh, continued to actively oppose union with Rome, and was succeeded by his nephew Eliya (designated as Eliya "VII" in older historiography, but renumbered as Eliya "VI" in recent scholarly works). During his Patriarchal tenure, from 1558 to 1591, the Church of the East preserved its traditional christology and full ecclesiastical independence.
The next Shimun Patriarch was likely Yahballaha V, who was elected in 1577 or 1578 and died within two years before seeking or obtaining confirmation from Rome. According to Tisserant, problems posed by the "Nestorian" traditionalists and the Ottoman authorities prevented any earlier election of a successor to Abdisho. David Wilmshurst and Murre-Vandenberg believe that, in the period between 1570 and the patriarchal election of Yahballaha, he or another of the same name was looked on as Patriarch. Yahballaha's successor, Shimun IX Dinkha (1580-1600), who moved away from Turkish rule to Salmas on Lake Urmia in Persia, was officially confirmed by the Pope in 1584. There are theories that he appointed his nephew, Shimun X Eliyah (1600–1638) as his successor, but others argue that his election was independent of any such designation. Regardless, from then until the 21st century the Shimun line employed a hereditary system of succession – the rejection of which was part of the reason for the creation of that line in the first place.
The next Eliya Patriarch, Eliya (VII) VIII (1591-1617), negotiated on several occasions with the Catholic Church, in 1605, 1610 and 1615–1616, but without final resolution. This likely alarmed Shimun X, who in 1616 sent to Rome a profession of faith that Rome found unsatisfactory, and another in 1619, which also failed to win him official recognition. Wilmshurst says it was this Shimun Patriarch who reverted to the "old faith" of Nestorianism, leading to a shift in allegiances that won for the Eliya line control of the lowlands and of the highlands for the Shimun line. Further negotiations between the Eliya line and the Catholic Church were cancelled during the Patriarchal tenure of Eliya (VIII) IX (1617-1660).
The next two Shimun Patriarchs, Shimun XI Eshuyow (1638–1656) and Shimun XII Yoalaha (1656-1662), wrote to the Pope in 1653 and 1658, according to Wilmshurst, while Murre-Vanderberg speaks only of 1648 and 1653. Wilmshurst says Shimun XI was sent the pallium, though Murre-Vanderberg argues official recognition was given to neither. A letter suggests that one of the two was removed from office (presumably by Nestorian traditionalists) for pro-Catholic leanings: Shimun XI according to Murre-Vanderberg, probably Shimun XII according to Wilmshurst.
Eliya (IX) X (1660-1700) was a "vigorous defender of the traditional [Nestorian] faith", and simultaneously the next Shimun Patriarch, Shimun XIII Dinkha (1662–1700), definitively broke with the Catholic Church. In 1670, he gave a traditionalist reply to an approach that was made from Rome, and by 1672 all connections with the Pope were ended. There were then two traditionalist Patriarchal lines, the senior Eliya line in Alqosh, and the junior Shimun line in Qochanis.
As the Shimun line "gradually returned to the traditional worship of the Church of the East, thereby losing the allegiance of the western regions", it moved from Turkish-controlled territory to Urmia in Persia. The bishopric of Amid (Diyarbak?r), the original headquarters of Shimun Sulaqa, became subject to the Alqosh Patriarch. In 1667 or 1668, Bishop Joseph of that see converted to the Catholic faith. In 1677, he obtained from the Turkish authorities recognition as holding independent power in Amid and Mardin, and in 1681 he was recognised by Rome as "Patriarch of the Chaldean nation deprived of its Patriarch" (Amid patriarchate). Thus was instituted the Josephite line, a third line of Patriarchs and the sole Catholic one at the time. All Joseph I's successors took the name "Joseph". The life of this Patriarchate was difficult: the leadership was continually vexed by traditionalists, while the community struggled under the tax burden imposed by the Ottoman authorities.
In 1771, Eliya (XI) XII and his designated successor (the future Eliya (XII) XIII Isho?yahb) made a profession of faith that was accepted by Rome, thus establishing communion. By then, acceptance of the Catholic position was general in the Mosul area. When Eliya (XI) XII died in 1778, Eliya (XII) XIII made a renewed profession of Catholic faith and was recognised by Rome as Patriarch of Mosul, but in May 1779 renounced that profession in favor of the traditional Nestorianism. His younger cousin Yohannan Hormizd was locally elected to replace him in 1780, but for various reasons was recognised by Rome only as Metropolitan of Mosul and Administrator of the Catholics of the Alqosh party, having the powers of a [atriarch but not the title or insignia. When Joseph IV of the Amid Patriarchate resigned in 1780, Rome likewise made his nephew, Augustine Hindi, whom he wished to be his successor, not Patriarch but Administrator. No one held the title of Chaldean Catholic patriarch for the next 47 years.
When Eliya (XII) XIII died in 1804, the Nestorian branch of the Eliya line died with him. With most of his subjects won over to union with Rome by Hormizd, they did not elect a new traditionalist Patriarch. In 1830, Hormizd was finally recognized as the Chaldean Catholic Patriarch of Babylon, marking the last remnant of the hereditary system within the Chaldean Catholic Church.
This also ended the rivalry between the senior Eliya line and the junior Shimun line, as Shimun XVI Yohannan (1780–1820) became the sole primate of the traditionalist Church of the East, "the legal successor of the initially Uniate patriarchate of the [Shimun] line". In 1976, it adopted the name Assyrian Church of the East and its patriarchate remained hereditary until the death in 1975 of Shimun XXI Eshai.
Accordingly, Joachim Jakob remarks that, ironically, "the original Patriarchate of the Church of the East"--the Eliya line--"entered into union with Rome and continues down to today in the form of the Chaldean [Catholic] Church" while the original Patriarchate of the Chaldean Catholic Church--the Shimun line--continues today in the Assyrian Church of the East.
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