Elijah Of Nisibis
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Elijah, Eliya, or Elias of Nisibis (, 11February 975– 18July 1046) was an Assyrian cleric of the
Church of the East 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, the Chaldean Church or the Nestorian Church, is one of three major branches o ...
, who served as
bishop of Beth Nuhadra Metropolitanate of Adiabene () was an East Syriac Rite, East Syriac metropolitan province of the Church of the East between the 5th and 14th centuries, with more than fifteen known suffragan dioceses at different periods in its history. Although t ...
(1002–1008) and
archbishop of Nisibis The Metropolitanate of Nisibis was an East Syriac metropolitan province of the Church of the East, between the fifth and seventeenth centuries. The ecclesiastical province of Nisibis (Syriac: Nisibin, , often abbreviated to Soba, ) had a number of ...
(1008–1046). He has been called the most important Christian writer in Arabic—or even throughout non-Christian Asia—during the 11th century. He is best known for his ''Chronography'', which is an important source for the history of
Sassanid Persia The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranian peoples, Iranians"), was an List of monarchs of Iran, Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, th ...
.


Name

He shares the name of the
Biblical The Bible is a collection of religious texts that are central to Christianity and Judaism, and esteemed in other Abrahamic religions such as Islam. The Bible is an anthology (a compilation of texts of a variety of forms) biblical languages ...
prophet In religion, a prophet or prophetess is an individual who is regarded as being in contact with a divinity, divine being and is said to speak on behalf of that being, serving as an intermediary with humanity by delivering messages or teachings ...
Elijah Elijah ( ) or Elias was a prophet and miracle worker who lived in the northern kingdom of Israel during the reign of King Ahab (9th century BC), according to the Books of Kings in the Hebrew Bible. In 1 Kings 18, Elijah defended the worsh ...
(, ''Eliyahu''), whose name meant "My God is
Jah Jah or Yah (, ''Yāh'') is a short form of the Tetragrammaton (YHWH), the personal name of God: Yahweh, which the ancient Israelites used. The conventional Christian English pronunciation of ''Jah'' is , even though the letter J here transliter ...
". The Syriac form of his name is Ēlīyā or Ēlīyāh (ܐܹܠܝܼܵܐ) in Classical and Eastern Syriac and Ēlīyō (ܐܶܠܺܝܳܐ) in Western Syriac. In Latin translation, this became Elias. He is usually distinguished as "Elijah of Nisibis" (; ) from the location of his archbishopric. He is also known by the patronymic (; ),. meaning "Elijah, son of
Shenna Shenna is a given name and surname. Notable people with the name include: * Shenna Bellows (born 1975), American politician * Leila Shenna, Moroccan former actress See also * Shanna (disambiguation) * Sheena (disambiguation) Sheena may refer to ...
", in reference to the place of his birth.


Life

Elijah was born in
Shenna Shenna is a given name and surname. Notable people with the name include: * Shenna Bellows (born 1975), American politician * Leila Shenna, Moroccan former actress See also * Shanna (disambiguation) * Sheena (disambiguation) Sheena may refer to ...
, just south of the
Little Zab The Little Zab or Lower Zab (, ''al-Zāb al-Asfal''; or '; , ''Zâb-e Kuchak''; , ''Zāba Taḥtāya'') is a river that originates in Iran and joins the Tigris just south of Al Zab in the Kurdistan region of Iraq. The Little Zab is approximatel ...
's confluence with the
Tigris The Tigris ( ; see #Etymology, below) is the eastern of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of the Armenian Highlands through the Syrian Desert, Syrian and Arabia ...
(near present-day
Al-Zab Al Zab, Al-Zab, or Az-Zab is a town in Iraq administered as part of the Kirkuk Governorate's Hawija District. Between 2014-2017, it was under the control of the Islamic State of Iraq and the Levant (ISIL) and was recaptured by Iraqi government ...
,
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
) on 11 February 975. On Sunday, 15September 994, he was
ordained Ordination is the process by which individuals are Consecration in Christianity, consecrated, that is, set apart and elevated from the laity class to the clergy, who are thus then authorized (usually by the religious denomination, denominationa ...
as a priest at the monastery of Mar Shemʿon by Yohannes, archbishop of Fars and
bishop of Shenna The Patriarchal Province of Seleucia-Ctesiphon was an ecclesiastical province of the Church of the East, with see in Seleucia-Ctesiphon. It was attested between the fifth and thirteenth centuries. As its name entails, it was the province of the ...
. He studied throughout northern
Mesopotamia Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
, including
Mosul Mosul ( ; , , ; ; ; ) is a major city in northern Iraq, serving as the capital of Nineveh Governorate. It is the second largest city in Iraq overall after the capital Baghdad. Situated on the banks of Tigris, the city encloses the ruins of the ...
. On Sunday, 15February 1002, he was
consecrated Sacred describes something that is dedicated or set apart for the service or worship of a deity; is considered worthy of spiritual respect or devotion; or inspires awe or reverence among believers. The property is often ascribed to objects (a ...
bishop of Beth Nuhadra Metropolitanate of Adiabene () was an East Syriac Rite, East Syriac metropolitan province of the Church of the East between the 5th and 14th centuries, with more than fifteen known suffragan dioceses at different periods in its history. Although t ...
(present-day
Dohuk Duhok (; ; , ) is a city in Kurdistan Region, Iraq. It is the Capital (political), capital city of Duhok Governorate. Name The city of Duhok received its name from the Kurdish languages, Kurdish words ’du’ (two) and ’hok’ (lump) as a ...
,
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
) by Yohannan, who had become the
Patriarch of the Church of the East The patriarch of the Church of the East (also known as patriarch of the East, patriarch of Babylon, the catholicose of the East or the grand metropolitan of the East) is the patriarch, or leader and head bishop (sometimes referred to as Cath ...
in 1000 by appealing directly to the
Abbasid The Abbasid Caliphate or Abbasid Empire (; ) was the third caliphate to succeed the prophets and messengers in Islam, Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib (566–653 C ...
governor at
Shiraz Shiraz (; ) is the List of largest cities of Iran, fifth-most-populous city of Iran and the capital of Fars province, which has been historically known as Pars (Sasanian province), Pars () and Persis. As of the 2016 national census, the popu ...
without regard to the usual election procedures. On Sunday, 26December 1008, he succeeded Yahballaha as
archbishop of Nisibis The Metropolitanate of Nisibis was an East Syriac metropolitan province of the Church of the East, between the fifth and seventeenth centuries. The ecclesiastical province of Nisibis (Syriac: Nisibin, , often abbreviated to Soba, ) had a number of ...
(present-day
Nusaybin Nusaybin () is a municipality and district of Mardin Province, Turkey. Its area is 1,079 km2, and its population is 115,586 (2022). The city is populated by Kurds of different tribal affiliation. Nusaybin is separated from the larger Kurd ...
,
Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
). From 15–29 July 1026, he paid a series of visits—the "Seven Sessions"—to the
Abbasid The Abbasid Caliphate or Abbasid Empire (; ) was the third caliphate to succeed the prophets and messengers in Islam, Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib (566–653 C ...
vizier A vizier (; ; ) is a high-ranking political advisor or Minister (government), minister in the Near East. The Abbasids, Abbasid caliphs gave the title ''wazir'' to a minister formerly called ''katib'' (secretary), who was at first merely a help ...
Abu'l-Qasim al-Husayn ibn Ali al-Maghribi to discuss Christian doctrines and other topics. Additional meetings between the two were held in December 1026 and June 1027. Three letters—two by Elijah and one by the vizier—are preserved from their correspondence the following year, showing their continuing good relations. He died on 18 July 1046 at Mayyafariqin.


Works


''Chronography''

Elijah is best known for his ''Chronography'' or ''Chronology'' (; ), which forms an important source concerning the history of
Sassanid Persia The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranian peoples, Iranians"), was an List of monarchs of Iran, Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, th ...
. It is divided into two sections, a
chronicle A chronicle (, from Greek ''chroniká'', from , ''chrónos'' – "time") is a historical account of events arranged in chronological order, as in a timeline. Typically, equal weight is given for historically important events and local events ...
modeled after
Eusebius Eusebius of Caesarea (30 May AD 339), also known as Eusebius Pamphilius, was a historian of Christianity, exegete, and Christian polemicist from the Roman province of Syria Palaestina. In about AD 314 he became the bishop of Caesarea Maritima. ...
's ''
Ecclesiastical History Church history or ecclesiastical history as an academic discipline studies the history of Christianity and the way the Christian Church has developed since its inception. Henry Melvill Gwatkin defined church history as "the spiritual side of the ...
'' and a treatment of calendars and calendrical calculations. It is exceptional among Syriac chronicles for the large amount of civil history Elijah included among his ecclesiastical notices. The chronicle includes separate lists of the
Sassanid dynasty The Sasanian dynasty (also known as the Sassanids or the House of Sasan) was the house that founded the Sasanian Empire of Iran, ruling this empire from 224 to 651 AD. It began with Ardashir I, who named the dynasty in honour of his predecessor, ...
(after the lost 7th-century work of
James of Edessa Jacob of Edessa (or James of Edessa) () (c. 640 – 5 June 708) was Bishop of Edessa and prominent Syriac Christian writer in Classical Syriac language, also known as one of earliest Syriac grammarians. In various works, he treated theologica ...
) and the
patriarchs of Seleucia The patriarch of the Church of the East (also known as patriarch of the East, patriarch of Babylon, the catholicose of the East or the grand metropolitan of the East) is the patriarch, or leader and head bishop (sometimes referred to as Cathol ...
(after the lost 5th-century work of
Annianus of Alexandria Annianus of Alexandria () was a monk and writer who flourished in Alexandria during the pontificate of Theophilus I around the beginning of the 5thcentury. Annianus criticized the world history of his contemporary, the monk Panodorus of Alexandr ...
). The
popes The pope is the bishop of Rome and the visible head of the worldwide Catholic Church. He is also known as the supreme pontiff, Roman pontiff, or sovereign pontiff. From the 8th century until 1870, the pope was the sovereign or head of sta ...
and other patriarchs are included in the general annals which begin during the reign of the Roman emperor
Tiberius Tiberius Julius Caesar Augustus ( ; 16 November 42 BC – 16 March AD 37) was Roman emperor from AD 14 until 37. He succeeded his stepfather Augustus, the first Roman emperor. Tiberius was born in Rome in 42 BC to Roman politician Tiberius Cl ...
and end with the year 1018. His treatment of calendrical systems has tables for computation of the Syriac and
Persian new year Nowruz (, , () , () , () , () , Kurdish: () , () , () , () , , , , () , , ) is the Iranian or Persian New Year. Historically, it has been observed by Iranian peoples, but is now celebrated by many ethnicities world ...
s and includes several
Zoroastrian Zoroastrianism ( ), also called Mazdayasnā () or Beh-dīn (), is an Iranian religion centred on the Avesta and the teachings of Zarathushtra Spitama, who is more commonly referred to by the Greek translation, Zoroaster ( ). Among the wo ...
calendars, along with their feasts and holidays. As seen, many of Elijah's own sources, which he thoroughly documents, have now been lost and his own work is preserved in only a single
manuscript A manuscript (abbreviated MS for singular and MSS for plural) was, traditionally, any document written by hand or typewritten, as opposed to mechanically printed or reproduced in some indirect or automated way. More recently, the term has ...
, which fortunately includes few omissions. The manuscript is in Syriac, with most paragraphs in the first section followed by an
Arabic Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns lang ...
translation. The ''Chronography'' was the last East Syrian text to be written in Syriac. There have been two published editions of the work: * . * . &


''Book of Sessions''

Elijah's ''Book of Sessions'' or ''Dialogues'' () claims to relate his conversations during his seven visits to the
Abbasid The Abbasid Caliphate or Abbasid Empire (; ) was the third caliphate to succeed the prophets and messengers in Islam, Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib (566–653 C ...
vizier A vizier (; ; ) is a high-ranking political advisor or Minister (government), minister in the Near East. The Abbasids, Abbasid caliphs gave the title ''wazir'' to a minister formerly called ''katib'' (secretary), who was at first merely a help ...
Abu'l-Qasim al-Husayn ibn Ali al-Maghribi. Dedicated to the "honorable, believing, elder brother" Abu al-ʿAla Saʿid ibn Sahl al-Katib, the work is intended as a literary apologetic as much as record of the events of the seven meetings, with its epilogue including the
imprimatur An imprimatur (sometimes abbreviated as ''impr.'', from Latin, "let it be printed") is a declaration authorizing publication of a book. The term is also applied loosely to any mark of approval or endorsement. The imprimatur rule in the Catho ...
of the patriarchal secretary Abu al-Faraj ʿAbd Allah ibn at-Tayyib. In order, the chapters cover: *
God In monotheistic belief systems, God is usually viewed as the supreme being, creator, and principal object of faith. In polytheistic belief systems, a god is "a spirit or being believed to have created, or for controlling some part of the un ...
's
unity Unity is the state of being as one (either literally or figuratively). It may also refer to: Buildings * Unity Building, Oregon, Illinois, US; a historic building * Unity Building (Chicago), Illinois, US; a skyscraper * Unity Buildings, Liverpoo ...
and
trinity The Trinity (, from 'threefold') is the Christian doctrine concerning the nature of God, which defines one God existing in three, , consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, thr ...
*
Jesus Jesus (AD 30 or 33), also referred to as Jesus Christ, Jesus of Nazareth, and many Names and titles of Jesus in the New Testament, other names and titles, was a 1st-century Jewish preacher and religious leader. He is the Jesus in Chris ...
's
incarnation Incarnation literally means ''embodied in flesh'' or ''taking on flesh''. It is the Conception (biology), conception and the embodiment of a deity or spirit in some earthly form or an Anthropomorphism, anthropomorphic form of a god. It is used t ...
of divine and human natures *
Quran The Quran, also Romanization, romanized Qur'an or Koran, is the central religious text of Islam, believed by Muslims to be a Waḥy, revelation directly from God in Islam, God (''Allah, Allāh''). It is organized in 114 chapters (, ) which ...
ic support for considering some forms of Christianity as a monotheistic religion *
Logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure o ...
al and
miraculous A miracle is an event that is inexplicable by natural or scientific lawsOne dictionary define"Miracle"as: "A surprising and welcome event that is not explicable by natural or scientific laws and is therefore considered to be the work of a divin ...
justifications for various
Christian doctrine Christian theology is the theology – the systematic study of the divine and religion – of Christianity, Christian belief and practice. It concentrates primarily upon the texts of the Old Testament and of the New Testament, as well as on Ch ...
s * Elijah's own profession of monotheism *
Language Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and signed language, signed forms, and may also be conveyed through writing syste ...
and considerations of its importance in
theology Theology is the study of religious belief from a Religion, religious perspective, with a focus on the nature of divinity. It is taught as an Discipline (academia), academic discipline, typically in universities and seminaries. It occupies itse ...
* Christian perspectives on
astrology Astrology is a range of Divination, divinatory practices, recognized as pseudoscientific since the 18th century, that propose that information about human affairs and terrestrial events may be discerned by studying the apparent positions ...
,
Islam Islam is an Abrahamic religions, Abrahamic monotheistic religion based on the Quran, and the teachings of Muhammad. Adherents of Islam are called Muslims, who are estimated to number Islam by country, 2 billion worldwide and are the world ...
, and the
soul The soul is the purported Mind–body dualism, immaterial aspect or essence of a Outline of life forms, living being. It is typically believed to be Immortality, immortal and to exist apart from the material world. The three main theories that ...
According to Elijah's account, the vizier asking for the meetings after he had experienced a miraculous cure at the hands of a Christian monk, causing him to reconsider his previous understanding of their faith as polytheistic and unfaithful to God. It is particularly remembered for its statement of Christian monotheism in trinity in its 5th dialogue.. A full
critical edition Textual criticism is a branch of textual scholarship, philology, and literary criticism that is concerned with the identification of textual variants, or different versions, of either manuscripts (mss) or of printed books. Such texts may range i ...
of the Book of Sessions along with the correspondence between Elijah and Abu'l-Qasim al-Maghribi was published by Nikolai N. Seleznyov.


Other works

Elijah also composed other theological and scholarly works. He wrote defenses of
Nestorianism Nestorianism is a term used in Christian theology and Church history to refer to several mutually related but doctrinary, doctrinarily distinct sets of teachings. The first meaning of the term is related to the original teachings of Christian t ...
against both
Islam Islam is an Abrahamic religions, Abrahamic monotheistic religion based on the Quran, and the teachings of Muhammad. Adherents of Islam are called Muslims, who are estimated to number Islam by country, 2 billion worldwide and are the world ...
and other
Christian denominations A Christian () is a person who follows or adheres to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. Christians form the largest religious community in the world. The words '' Christ'' and ''C ...
and treatises on Syrian
canon law Canon law (from , , a 'straight measuring rod, ruler') is a set of ordinances and regulations made by ecclesiastical jurisdiction, ecclesiastical authority (church leadership) for the government of a Christian organization or church and its membe ...
,
asceticism Asceticism is a lifestyle characterized by abstinence from worldly pleasures through self-discipline, self-imposed poverty, and simple living, often for the purpose of pursuing Spirituality, spiritual goals. Ascetics may withdraw from the world ...
, and
ethics Ethics is the philosophy, philosophical study of Morality, moral phenomena. Also called moral philosophy, it investigates Normativity, normative questions about what people ought to do or which behavior is morally right. Its main branches inclu ...
. His guide to "rational management" of anxiety () is also dedicated to the Abbasid vizier, whom he claims requested such a book during their sessions together. It advocates cultivating a general thankfulness; treatment of general anxiety through the religious virtues of piety, gratitude, chastity, humility, mercy, and repentance; and treatment of specific anxieties through the philosophical virtues of seeking advice, behaving well, and being generous, just, and forgiving. His "Letter on the Unity of the Creator and Trinity of His Hypotases" () states the arguments for
trinitarianism The Trinity (, from 'threefold') is the Christian doctrine concerning the nature of God, which defines one God existing in three, , consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, three ...
for a curious Islamic judge. His "Letter on the Merit of Chastity" () attempts to refute Muʿtazilī al-Jāhiz's (. 869) arguments in favor of physical pleasure. He also composed a Syriac grammar and a Syriac–Arabic dictionary, ''The Book of the Interpreter'' (, '' 'The Book of the Interpreter for Teaching the Syriac Language' ''). The Arabic sections of the book were written using
Garshuni Garshuni or Karshuni (Syriac alphabet: , Arabic alphabet: ) are Arabic writings using the Syriac alphabet. The word "Garshuni", derived from the word "grasha" which literally translates as "pulling", was used by George Kiraz to coin the term " gar ...
, a transliteration of Arabic into the
Syriac alphabet The Syriac alphabet ( ) is a writing system primarily used to write the Syriac language since the 1st century. It is one of the Semitic languages, Semitic abjads descending from the Aramaic alphabet through the Palmyrene alphabet, and shares sim ...
. The work was further translated into
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
by
Thomas Obicini Thomas Obicini of Novara (; 1585– 7 November 1632) was an Italian Franciscan friar, originally from Novara. As an early orientalist, Arabist and linguist, he translated Arabic texts into Latin and took possession of the Grotto of Nazareth f ...
as his 1636 '.. ,& Editions of these works include: * . * . Reprint: Gorgias Press, 2012.


Legacy

In addition to Elijah's importance to Persian history and for his preservation of passages of otherwise lost ancient and medieval authors, he became famed throughout the Islamic world for his studious method and wide-ranging expertise in
Christian A Christian () is a person who follows or adheres to Christianity, a Monotheism, monotheistic Abrahamic religion based on the life and teachings of Jesus in Christianity, Jesus Christ. Christians form the largest religious community in the wo ...
and
Islamic theology Schools of Islamic theology are various Islamic schools and branches in different schools of thought regarding creed. The main schools of Islamic theology include the extant Mu'tazili, Ash'ari, Maturidi, and Athari schools; the extinct ones ...
,
language and literature ''Language and Literature'' is a peer-reviewed academic journal that publishes articles in the field of stylistics. The journal's editor is Dan McIntyre (University of Huddersfield). It has been published since 1992, first by Longman and then by ...
,
philosophy Philosophy ('love of wisdom' in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, Value (ethics and social sciences), value, mind, and language. It is a rational an ...
,
medicine Medicine is the science and Praxis (process), practice of caring for patients, managing the Medical diagnosis, diagnosis, prognosis, Preventive medicine, prevention, therapy, treatment, Palliative care, palliation of their injury or disease, ...
, and
mathematics Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
.


Notes


References

In addition to surviving manuscripts of Elijah's own works, the other
primary source In the study of history as an academic discipline, a primary source (also called an original source) is an Artifact (archaeology), artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was cre ...
for his story is
Mari ibn Sulaiman Mari ibn Suleiman or Sulaiman () was a 12th-century Nestorian Christian author writing in Arabic. Nothing is known of his life. He is the author of a theological and historiographical work known as the Book of the Tower (''Kitāb al-Majdal''). The ...
's ''Book of the Tower'', as expanded and emended by
Amr ibn Matta ʿAmr ibn Mattā or Mattai al-Ṭīrhānī (, , ''Amru ibn Matta'') was the author of a 14th-century work known as ''The Book of the Tower'' (). Ibn Matta's work is modelled after, and takes its title from, the ''Book of the Tower'' by 12th-century ...
and
Saliba ibn Yuhanna Saliba or Sliba ibn Yuhanna () was a medieval Syriac Christian, author of a 1332 Arabic compendium known as ''The Books of Secrets'' (''Asfar al-Asrar''). Born in Mosul in the late 13th century, he was active in Jazīrat Ibn ʿUmar on the upper T ...
.


Citations


Bibliography

* . * . * . * . * . * . & * . * . * {{authority control 975 births 1046 deaths 11th-century historians from the Abbasid Caliphate 11th-century Christian theologians 11th-century bishops of the Church of the East Linguists Nestorians in the Abbasid Caliphate Church of the East writers