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In the year before the
First Council of Constantinople The First Council of Constantinople (; ) was a council of Christian bishops convened in Constantinople (now Istanbul, Turkey) in AD 381 by the Roman Emperor Theodosius I. This second ecumenical council, an effort to attain consensus in the ...
in 381, Nicean Christianity became the official religion of the
Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
when
Theodosius I Theodosius I ( ; 11 January 347 – 17 January 395), also known as Theodosius the Great, was Roman emperor from 379 to 395. He won two civil wars and was instrumental in establishing the Nicene Creed as the orthodox doctrine for Nicene C ...
, emperor of the East,
Gratian Gratian (; ; 18 April 359 – 25 August 383) was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian was raised to the rank of ''Augustus'' as a child and inherited the West after his father's death in ...
, emperor of the West, and Gratian's junior co-ruler
Valentinian II Valentinian II (; 37115 May 392) was a Roman emperor in the western part of the Roman Empire between AD 375 and 392. He was at first junior co-ruler of his half-brother, then was sidelined by a usurper, and finally became sole ruler after 388, ...
issued the
Edict of Thessalonica An edict is a decree or announcement of a law, often associated with monarchies, but it can be under any official authority. Synonyms include "dictum" and "pronouncement". ''Edict'' derives from the Latin wikt:edictum#Latin, edictum. Notable ed ...
in 380, which recognized the
catholic The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...
orthodoxy Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
, as defined by the Council of Nicea, as the Roman Empire's state religion. Historians refer to the imperial church in a variety of ways: as the catholic church, the orthodox church, the imperial church, the Roman church, or the Byzantine church, although some of those terms are also used for wider communions extending outside the Roman Empire. The
Eastern Orthodox Church The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is List of Christian denominations by number of members, one of the three major doctrinal and ...
,
Oriental Orthodoxy The Oriental Orthodox Churches are Eastern Christian churches adhering to Miaphysite Christology, with approximately 50 million members worldwide. The Oriental Orthodox Churches adhere to the Nicene Christian tradition. Oriental Orthodoxy is ...
, and the
Catholic Church The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...
all claim to stand in continuity from the Nicene church to which Theodosius granted recognition. Political differences between the Eastern Roman Empire and the Persian
Sassanid Empire The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranians"), was an Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, the length of the Sasanian dynasty's reign ...
led to the separation 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 ...
in 424. Doctrinal split within the Roman imperial church led to the independence of the early Oriental Orthodoxy. The fall of the Western Roman Empire initiated the gradual separation between Eastern and
Western Christianity Western Christianity is one of two subdivisions of Christianity (Eastern Christianity being the other). Western Christianity is composed of the Latin Church and Protestantism, Western Protestantism, together with their offshoots such as the O ...
, which culminated in the
East-West schism East West (or East and West) may refer to: *East–West dichotomy, the contrast between Eastern and Western society or culture Arts and entertainment Books, journals and magazines *'' East, West'', an anthology of short stories written by Salm ...
of 1054. The Western church evolved into the
Latin Catholic Church The Latin Church () is the largest autonomous () particular church within the Catholic Church, whose members constitute the vast majority of the 1.3 billion Catholics. The Latin Church is one of 24 Catholic particular churches and liturgical ...
while the Eastern church body that remained under the patronage of the Eastern empire evolved into the
Greek Orthodox Church Greek Orthodox Church (, , ) is a term that can refer to any one of three classes of Christian Churches, each associated in some way with Christianity in Greece, Greek Christianity, Antiochian Greek Christians, Levantine Arabic-speaking Christian ...
. Earlier in the 4th century, following the Diocletianic Persecution of 303–313 and the
Donatist Donatism was a schism from the Catholic Church in the Archdiocese of Carthage from the fourth to the sixth centuries. Donatists argued that Christian clergy must be faultless for their ministry to be effective and their prayers and sacraments to ...
controversy that arose in consequence,
Constantine the Great Constantine I (27 February 27222 May 337), also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a Constantine the Great and Christianity, pivotal ro ...
had convened councils of bishops to define the
orthodoxy Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
of the Christian faith and to expand on earlier Christian councils. A series of
ecumenical councils An ecumenical council, also called general council, is a meeting of bishops and other church authorities to consider and rule on questions of Christian doctrine, administration, discipline, and other matters in which those entitled to vote are ...
convened by successive Roman emperors met during the 4th and the 5th centuries, but Christianity continued to suffer rifts and schisms surrounding the
theological Theology is the study of religious belief from a religious perspective, with a focus on the nature of divinity. It is taught as an academic discipline, typically in universities and seminaries. It occupies itself with the unique content of an ...
and
christological In Christianity, Christology is a branch of theology that concerns Jesus. Different denominations have different opinions on questions such as whether Jesus was human, divine, or both, and as a messiah what his role would be in the freeing of ...
doctrines of
Arianism Arianism (, ) is a Christology, Christological doctrine which rejects the traditional notion of the Trinity and considers Jesus to be a creation of God, and therefore distinct from God. It is named after its major proponent, Arius (). It is co ...
,
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 ...
,
Miaphysitism Miaphysitism () is the Christological doctrine that holds Jesus, the Incarnate Word, is fully divine and fully human, in one nature ('' physis'', ). It is a position held by the Oriental Orthodox Churches. It differs from the Dyophysitism of ...
, and
Dyophysitism Dyophysitism (; from Ancient Greek, Greek δύο ''dyo'', "two" and φύσις ''physis'', "nature") is the Christology, Christological position that Jesus Christ is in two distinct, inseparable natures: God in Christianity, divine and human natur ...
. In the 5th century, the
Western Roman Empire In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...
decayed as a
polity A polity is a group of people with a collective identity, who are organized by some form of political Institutionalisation, institutionalized social relations, and have a capacity to mobilize resources. A polity can be any group of people org ...
; invaders sacked
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
in 410 and in 455, and
Odoacer Odoacer ( – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who deposed the Western Roman child emperor Romulus Augustulus and became the ruler of Italy (476–493). Odoacer' ...
, an Arian barbarian warlord, forced
Romulus Augustus Romulus Augustus (after 511), nicknamed Augustulus, was Roman emperor of the West from 31 October 475 until 4 September 476. Romulus was placed on the imperial throne while still a minor by his father Orestes, the , for whom he served as littl ...
, the last nominal Western Emperor, to abdicate in 476. However, apart from the aforementioned schisms, the church as an institution persisted in communion, if not without tension, between the
East East is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fact that ea ...
and
West West is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some Romance langu ...
. In the 6th century, the Byzantine armies of the
Byzantine Emperor The foundation of Constantinople in 330 AD marks the conventional start of the Eastern Roman Empire, which Fall of Constantinople, fell to the Ottoman Empire in 1453 AD. Only the emperors who were recognized as legitimate rulers and exercised s ...
Justinian I Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
recovered Italy and other regions of the Western Mediterranean shore. The
Byzantine Empire The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived History of the Roman Empire, the events that caused the ...
soon lost most of these gains, but it held Rome, as part of the
Exarchate of Ravenna The Exarchate of Ravenna (; ), also known as the Exarchate of Italy, was an administrative district of the Byzantine Empire comprising, between the 6th and 8th centuries, the territories under the jurisdiction of the exarch of Italy (''exarchus ...
, until 751, a period known in
church 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 t ...
as the Byzantine Papacy. The
early Muslim conquests The early Muslim conquests or early Islamic conquests (), also known as the Arab conquests, were initiated in the 7th century by Muhammad, the founder of Islam. He established the first Islamic state in Medina, Arabian Peninsula, Arabia that ...
of the 7th–9th centuries would begin a process of converting most of the then-Christian world in
the Levant The Levant ( ) is the subregion that borders the Eastern Mediterranean sea to the west, and forms the core of West Asia and the political term, ''Middle East''. In its narrowest sense, which is in use today in archaeology and other cultura ...
,
Middle East The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq. The term came into widespread usage by the United Kingdom and western Eur ...
,
North Africa North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...
, regions of
Southern Italy Southern Italy (, , or , ; ; ), also known as () or (; ; ; ), is a macroregion of Italy consisting of its southern Regions of Italy, regions. The term "" today mostly refers to the regions that are associated with the people, lands or cultu ...
and the
Iberian Peninsula The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...
to
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 ...
, severely restricting the reach both of the Byzantine Empire and of its church. Christian missionary activity directed from the capital of
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
did not lead to a lasting expansion of the formal link between the church and the Byzantine emperor, since areas outside the Byzantine Empire's political and military control set up their own distinct churches, as in the case of
Bulgaria Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...
in 919.
Justinian I Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
, who became emperor in 527, recognized the
patriarch The highest-ranking bishops in Eastern Orthodoxy, Oriental Orthodoxy, the Roman Catholic Church (above major archbishop and primate), the Hussite Church, Church of the East, and some Independent Catholic Churches are termed patriarchs (and ...
s of
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
,
Alexandria Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...
,
Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
, and
Jerusalem Jerusalem is a city in the Southern Levant, on a plateau in the Judaean Mountains between the Mediterranean Sea, Mediterranean and the Dead Sea. It is one of the List of oldest continuously inhabited cities, oldest cities in the world, and ...
as the supreme authorities in the state-sponsored
Chalcedonian Chalcedonian Christianity is the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definitio ...
church apparatus (see the
Pentarchy Pentarchy (, ) was a model of Church organization formulated in the laws of Emperor Justinian I () 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 Em ...
). However, Justinian claimed " the right and duty of regulating by his laws the minutest details of worship and discipline, and also of dictating the theological opinions to be held in the Church". In Justinian's day, the Christian church was not entirely under the emperor's control even in the East: the Oriental Orthodox Churches had seceded, having rejected the
Council of Chalcedon The Council of Chalcedon (; ) was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia (modern-day Kadıköy, Istanbul, Turkey) from 8 Oct ...
in 451, and called the adherents of the imperially-recognized church "
Melkite The term Melkite (), also written Melchite, refers to various Eastern Christian churches of the Byzantine Rite and their members originating in West Asia. The term comes from the common Central Semitic root ''m-l-k'', meaning "royal", referrin ...
s", from Syriac ''malkâniya'' ("imperial"). In
Western Europe Western Europe is the western region of Europe. The region's extent varies depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the East" and originally applied to the Western half of the ancient Mediterranean ...
, Christianity was mostly subject to the laws and customs of nations that owed no allegiance to the emperor in Constantinople.Ayer (1913), pp. 538–539 While Eastern-born popes appointed or at least confirmed by the emperor continued to be loyal to him as their political lord, they refused to accept his authority in religious matters, or the authority of such a council as the imperially convoked
Council of Hieria The Council of Hieria was a Christian council of 754 which viewed itself as ecumenical, but was later rejected by the Second Council of Nicaea (787) and by Roman Catholic and Eastern Orthodox churches, since four of the five major patriarchs ref ...
of 754.
Pope Gregory III Pope Gregory III (; died 28 November 741) was the bishop of Rome from 11 February 731 to his death on 28 November 741. His pontificate, like that of his predecessor, was disturbed by Byzantine iconoclasm and the advance of the Lombards, in which ...
(731–741) was the last Bishop of Rome to ask the Byzantine ruler to ratify his election. With the crowning of
Charlemagne Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
by
Pope Leo III Pope Leo III (; died 12 June 816) was bishop of Rome and ruler of the Papal States from 26 December 795 to his death on 12 June 816. Protected by Charlemagne from the supporters of his predecessor, Adrian I, Leo subsequently strengthened Charlem ...
on 25 December 800 as ''
Imperator Romanorum The Holy Roman Emperor, originally and officially the Emperor of the Romans (disambiguation), Emperor of the Romans (; ) during the Middle Ages, and also known as the Roman-German Emperor since the early modern period (; ), was the ruler and h ...
'', the political split between East and West became irrevocable. Spiritually,
Chalcedonian Christianity Chalcedonian Christianity is the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definiti ...
persisted, at least in theory, as a unified entity until the Great Schism and its formal division with the mutual excommunication in 1054 of Rome and Constantinople. The empire finally collapsed with the
Fall of Constantinople The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of Constantinople, the capital of the Byzantine Empire by the Ottoman Empire. The city was captured on 29 May 1453 as part of the culmination of a 55-da ...
to the Islamic
Ottoman Turks The Ottoman Turks () were a Turkic peoples, Turkic ethnic group in Anatolia. Originally from Central Asia, they migrated to Anatolia in the 13th century and founded the Ottoman Empire, in which they remained socio-politically dominant for the e ...
in 1453. The obliteration of the empire's boundaries by
Germanic peoples The Germanic peoples were tribal groups who lived in Northern Europe in Classical antiquity and the Early Middle Ages. In modern scholarship, they typically include not only the Roman-era ''Germani'' who lived in both ''Germania'' and parts of ...
and an outburst of missionary activity among these peoples, who had no direct links with the empire, and among Pictic and Celtic peoples who had never been part of the Roman Empire, fostered the idea of a universal church free from association with a particular state.Gerland, Ernst. "The Byzantine Empire"
in The Catholic Encyclopedia. Vol. 3. New York: Robert Appleton Company, 1908. Retrieved 19 July 2010
On the contrary, "in the East Roman or Byzantine view, when the Roman Empire became Christian, the perfect world order willed by God had been achieved: one universal empire was sovereign, and coterminous with it was the one universal church"; and the church came, by the time of the demise of the Byzantine Empire in 1453, to merge psychologically with it to the extent that its bishops had difficulty in thinking of Nicene Christianity without an emperor.Schadé (2006), art. "Byzantine Church" The legacy of the idea of a universal church carries on in today's Catholic Church, Eastern Orthodox Church, Oriental Orthodox Churches, and 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 ...
. Many other churches, such as the
Anglican Communion The Anglican Communion is a Christian Full communion, communion consisting of the Church of England and other autocephalous national and regional churches in full communion. The archbishop of Canterbury in England acts as a focus of unity, ...
, claim
succession Succession is the act or process of following in order or sequence. Governance and politics *Order of succession, in politics, the ascension to power by one ruler, official, or monarch after the death, resignation, or removal from office of ...
to this universal church.


History


Early Christianity in relation to the state

Before the end of the 1st century, the Roman authorities recognized Christianity as a separate religion from Judaism. The distinction, perhaps already made in practice at the time of the
Great Fire of Rome The Great Fire of Rome () began on 19 July 64 AD. The fire started in the merchant shops around Rome's chariot stadium, Circus Maximus. After six days, the fire was brought under control, but before the damage could be assessed, the fire reignit ...
in the year 64, was given official status by the emperor
Nerva Nerva (; born Marcus Cocceius Nerva; 8 November 30 – 27 January 98) was a Roman emperor from 96 to 98. Nerva became emperor when aged almost 66, after a lifetime of imperial service under Nero and the succeeding rulers of the Flavian dynast ...
around the year 98 by granting Christians exemption from paying the '' Fiscus Iudaicus'', the annual tax upon the Jews.
Pliny the Younger Gaius Plinius Caecilius Secundus (born Gaius Caecilius or Gaius Caecilius Cilo; 61 – ), better known in English as Pliny the Younger ( ), was a lawyer, author, and magistrate of Ancient Rome. Pliny's uncle, Pliny the Elder, helped raise and e ...
, when
propraetor In ancient Rome, a promagistrate () was a person who was granted the power via '' prorogation'' to act in place of an ordinary magistrate in the field. This was normally ''pro consule'' or ''pro praetore'', that is, in place of a consul or praet ...
in
Bithynia Bithynia (; ) was an ancient region, kingdom and Roman province in the northwest of Asia Minor (present-day Turkey), adjoining the Sea of Marmara, the Bosporus, and the Black Sea. It bordered Mysia to the southwest, Paphlagonia to the northeast a ...
in 103, assumes in his letters to
Trajan Trajan ( ; born Marcus Ulpius Traianus, 18 September 53) was a Roman emperor from AD 98 to 117, remembered as the second of the Five Good Emperors of the Nerva–Antonine dynasty. He was a philanthropic ruler and a successful soldier ...
that because Christians do not pay the tax, they are not Jews.Wylen (1995). pp. 190–192.Dunn (1999). pp. 33–34.Boatwright (2004). p. 426. Since paying taxes had been one of the ways that Jews demonstrated their goodwill and loyalty toward the empire, Christians had to negotiate their own alternatives to participating in the
imperial cult An imperial cult is a form of state religion in which an emperor or a dynasty of emperors (or rulers of another title) are worshipped as demigods or deities. "Cult (religious practice), Cult" here is used to mean "worship", not in the modern pejor ...
. Their refusal to worship the
Roman gods The Roman deities most widely known today are those the Romans identified with Greek counterparts, integrating Greek myths, iconography, and sometimes religious practices into Roman culture, including Latin literature, Roman art, and relig ...
or to pay homage to the emperor as divine resulted at times in persecution and martyrdom.
Church Father The Church Fathers, Early Church Fathers, Christian Fathers, or Fathers of the Church were ancient and influential Christian theologians and writers who established the intellectual and doctrinal foundations of Christianity. The historical per ...
Tertullian Tertullian (; ; 155 – 220 AD) was a prolific Early Christianity, early Christian author from Roman Carthage, Carthage in the Africa (Roman province), Roman province of Africa. He was the first Christian author to produce an extensive co ...
, for instance, attempted to argue that Christianity was not inherently treasonous, and that Christians could offer their own form of prayer for the well-being of the emperor. Christianity spread especially in the eastern parts of the empire and beyond its border; in the west it was at first relatively limited, but significant Christian communities emerged in
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
,
Carthage Carthage was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classic ...
, and other urban centers, becoming by the end of the
3rd century The 3rd century was the period from AD 201 (represented by the Roman numerals CCI) to AD 300 (CCC) in accordance with the Julian calendar. In this century, the Roman Empire saw a crisis, starting with the assassination of the Roman Emperor ...
, the dominant faith in some of them. Christians accounted for approximately 10% of the Roman population by 300, according to some estimates. Christianity then rapidly grew in the 4th century -
Rodney Stark Rodney William Stark (July 8, 1934 – July 21, 2022) was an American sociologist of religion who was a longtime professor of sociology and of comparative religion at the University of Washington. At the time of his death he was the Distinguished ...
estimated that Christians accounted for 56.5% of the Roman population by 350. According to
Will Durant William James Durant (; November 5, 1885 – November 7, 1981) was an American historian and philosopher, best known for his eleven-volume work, '' The Story of Civilization'', which contains and details the history of Eastern and Western civil ...
, the
Christian Church In ecclesiology, the Christian Church is what different Christian denominations conceive of as being the true body of Christians or the original institution established by Jesus Christ. "Christian Church" has also been used in academia as a syn ...
prevailed over paganism because it offered a much more attractive doctrine and because the church leaders addressed human needs better than their rivals.Durant, Will. Caesar and Christ. New York: Simon and Schuster. 1972 In 301, the Kingdom of Armenia (antiquity), Kingdom of Armenia, nominally a Roman client kingdom but ruled by a Parthian Empire, Parthian dynasty, became the first nation to adopt Christianity as its state religion, with the possible exception of Osroene in 201.


Establishment and early controversies

In 311, with the Edict of Serdica the dying Emperor Galerius ended the Diocletianic Persecution that he is reputed to have instigated, and in 313, Emperor Constantine I, Constantine issued the Edict of Milan, granting to Christians and others "the right of open and free observance of their worship". Constantine began to utilize Christian symbols such as the Chi Rho early in his reign but still encouraged traditional Roman religious practices including Sol invictus#Constantine, sun worship. In 330, Constantine established the city of
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
as the new capital of the Roman Empire. The city would gradually come to be seen as the intellectual and cultural center of the Christian world. Over the course of the Christianity in the 4th century, 4th century the Christian body became consumed by debates surrounding
orthodoxy Orthodoxy () is adherence to a purported "correct" or otherwise mainstream- or classically-accepted creed, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical co ...
, i.e. which religious doctrines are the correct ones. In the early 4th century, a group in North Africa during Antiquity, North Africa, later called Donatism, Donatists, who believed in a very rigid interpretation of Christianity that excluded many apostasy, who had abandoned the faith during the Diocletianic Persecution, created a crisis in the western empire. A synod was held in Synod of Rome (313), Rome in 313, followed by another in Synod of Arles (314), Arles in 314. These synods ruled that the Donatist faith was heresy and, when the Donatists refused to recant, Constantine launched the first campaign of persecution by Christians against Christians, and began imperial involvement in Christian theology. However, during the reign of Emperor Julian the Apostate, the Donatists, who formed the majority party in the Roman province of Africa for 30 years, were given official approval.


Debates within Christianity

Christian scholars and populace within the empire were increasingly embroiled in debates regarding christology (i.e., regarding the nature of the Christ). Opinions ranged from belief that Jesus was Jewish Christianity, entirely human to belief that he was Docetism, entirely divine. The most persistent debate was that between the Homoousios, homoousian view (the Father and the Son are of one substance), defined at the First Council of Nicaea, Council at Nicaea in 325 and later championed by Athanasius of Alexandria, and the Arianism, Arian view (the Father and the Son are similar, but the Father is greater than the Son). Emperors thereby became ever more involved with the increasingly divided early Church. Constantine backed the Nicene Creed of Nicaea, but was baptized on his deathbed by the Eusebius of Nicomedia, a bishop with Arian sympathies. His successor Constantius II supported Arian positions: under his rule, the Council of Constantinople (360), Council of Constantinople in 360 supported the Arian view. After the interlude of Emperor Julian the Apostate, Julian, who wanted to return to the pagan Roman/Greek religion, the west stuck to the Nicene Creed, while Arianism or Semi-Arianism was dominant in the east (under Emperor Valens), until Emperor Theodosius I called the First Council of Constantinople, Council of Constantinople in 381, which reasserted the Nicene view and rejected the Arian view. This council further refined the definition of orthodoxy, issuing the Nicene-Constantinopolitan Creed. On 27 February of the previous year, Theodosius I established, with the
Edict of Thessalonica An edict is a decree or announcement of a law, often associated with monarchies, but it can be under any official authority. Synonyms include "dictum" and "pronouncement". ''Edict'' derives from the Latin wikt:edictum#Latin, edictum. Notable ed ...
, the Christianity of the First Council of Nicaea as the official state religion, reserving for its followers the title of Catholic Christians and declaring that those who did not follow the religion taught by Pope Damasus I of Rome and Pope Peter II of Alexandria, Pope Peter of Alexandria were to be called heresy, heretics: In 391, Theodosius closed all the "pagan" (non-Christian and non-Jewish) temples and formally forbade pagan worship.


Late antiquity

At the end of the 4th century the Roman Empire had effectively split into two parts although their economies and the imperial-recognized church were still strongly tied. The two halves of the empire had always had cultural differences, exemplified in particular by the widespread use of the Greek language in the Eastern Empire and its more limited use in the West (Greek, as well as Latin, was used in the West, but Latin was the spoken vernacular). By the time Christianity became the state religion of the empire at the end of the 4th century, scholars in the West had largely abandoned Greek in favor of Latin. Even the Church in Rome, where Greek continued to be used in the liturgy longer than in the provinces, abandoned Greek. Jerome's Vulgate had begun to replace the Vetus Latina, older Latin translations of the Bible. The Christianity in the 5th century, 5th century would see the further fracturing of Christendom. Emperor Theodosius II, Theodosius II called two synods in Ephesus, one in 431 and one in 449, the First Council of Ephesus, first of which condemned the teachings of Patriarch Nestorius of Constantinople, while the second supported the teachings of Eutyches against Archbishop Flavian of Constantinople.Price (2005), p. 52 Nestorius taught that Christ's divine and human nature were distinct persons, and hence Mary (mother of Jesus), Mary was the mother of Christ but not the mother of God. Eutyches taught on the contrary that there was in Christ only a single nature, different from that of human beings in general. The First Council of Ephesus rejected Nestorius' view, causing churches centered around the School of Edessa, a city at the edge of the empire, to break with the imperial church (see Nestorian schism). Persecuted within the Roman Empire, many Nestorians fled to Persia and joined the Sassanid Church (the future
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 ...
). The Second Council of Ephesus upheld the view of Eutyches, but was overturned two years later by the
Council of Chalcedon The Council of Chalcedon (; ) was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia (modern-day Kadıköy, Istanbul, Turkey) from 8 Oct ...
, called by Emperor Marcian. Rejection of the Council of Chalcedon led to the exodus from the state church of the majority of Christians in Egypt and many in the Levant, who preferred miaphysitism, Miaphysite theology. Thus, within a century of the link established by Theodosius between the emperor and the church in his empire, it suffered a significant diminishment. Those who upheld the Council of Chalcedon became known in Syriac language, Syriac as
Melkite The term Melkite (), also written Melchite, refers to various Eastern Christian churches of the Byzantine Rite and their members originating in West Asia. The term comes from the common Central Semitic root ''m-l-k'', meaning "royal", referrin ...
s, the ''imperial'' group, followers of the ''emperor'' (in Syriac, ''malka''). This schism resulted in an independent communion of churches, including the Egyptian, Syrian, Ethiopian and Armenian churches, that is today known as
Oriental Orthodoxy The Oriental Orthodox Churches are Eastern Christian churches adhering to Miaphysite Christology, with approximately 50 million members worldwide. The Oriental Orthodox Churches adhere to the Nicene Christian tradition. Oriental Orthodoxy is ...
. In spite of these schisms, however, the Chalcedonian Nicene church still represented the majority of Christians within the by now already diminished Roman Empire.


End of the Western Roman Empire

In the 5th century, the Western Empire rapidly Decline of the Roman Empire, decayed and by the end of the century was no more. Within a few decades, Germanic tribes, particularly the Goths and Vandals, conquered the western provinces. Rome was sacked in 410 and 455, and was to be sacked again in the following century in Sack of Rome (546), 546. By 476, the Germanic chieftain
Odoacer Odoacer ( – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who deposed the Western Roman child emperor Romulus Augustulus and became the ruler of Italy (476–493). Odoacer' ...
had conquered Italy and deposed the last western emperor,
Romulus Augustus Romulus Augustus (after 511), nicknamed Augustulus, was Roman emperor of the West from 31 October 475 until 4 September 476. Romulus was placed on the imperial throne while still a minor by his father Orestes, the , for whom he served as littl ...
, though he nominally submitted to the authority of Constantinople. The Arian Germanic tribes established their own systems of churches and bishops in the western provinces but were generally tolerant of the population who chose to remain in communion with the imperial church. In 533, Roman Emperor Justinian I, Justinian in Constantinople launched a military campaign to reclaim the western provinces from the Arian Germans, starting with North Africa and proceeding to Italy. His success in recapturing much of the western Mediterranean was temporary. The empire soon lost most of these gains, but held Rome, as part of the
Exarchate of Ravenna The Exarchate of Ravenna (; ), also known as the Exarchate of Italy, was an administrative district of the Byzantine Empire comprising, between the 6th and 8th centuries, the territories under the jurisdiction of the exarch of Italy (''exarchus ...
, until 751. Justinian definitively established Caesaropapism,Ayer (1913), p. 538 believing "he had the right and duty of regulating by his laws the minutest details of worship and discipline, and also of dictating the theological opinions to be held in the Church".Ayer (1913), p. 553 According to the entry in Liddell & Scott, the term ''orthodoxy, orthodox'' first occurs in the Codex Justinianus: "We direct that all Catholic churches, throughout the entire world, shall be placed under the control of the orthodox bishops who have embraced the Nicene Creed." By the end of the 6th century the church within the Empire had become firmly tied with the imperial government, while in the west Christianity was mostly subject to the laws and customs of nations that owed no allegiance to the emperor.


Patriarchates in the Empire

Emperor
Justinian I Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
assigned to five sees, those of Holy See, Rome, Patriarchate of Constantinople, Constantinople, Patriarchate of Alexandria, Alexandria, Patriarchate of Antioch, Antioch and Jerusalem in Christianity, Jerusalem, a superior ecclesial authority that covered the whole of his empire. The First Council of Nicaea in 325 reaffirmed that the bishop of a provincial capital, the metropolitan bishop, had a certain authority over the bishops of the province. But it also recognized the existing supra-metropolitan authority of the sees of Rome, Alexandria and Antioch, and granted special recognition to Jerusalem. Constantinople was added at the
First Council of Constantinople The First Council of Constantinople (; ) was a council of Christian bishops convened in Constantinople (now Istanbul, Turkey) in AD 381 by the Roman Emperor Theodosius I. This second ecumenical council, an effort to attain consensus in the ...
(381) and given authority initially only over Thrace. By a canon of contested validity, the
Council of Chalcedon The Council of Chalcedon (; ) was the fourth ecumenical council of the Christian Church. It was convoked by the Roman emperor Marcian. The council convened in the city of Chalcedon, Bithynia (modern-day Kadıköy, Istanbul, Turkey) from 8 Oct ...
(451) placed Asia (Roman province), Asia and Diocese of Pontus, Pontus, which together made up Anatolia, under Constantinople, although their autonomy had been recognized at the council of 381. Rome never recognized this pentarchy of five sees as constituting the leadership of the church. It maintained that, in accordance with the First Council of Nicaea, only the three "Saint Peter, Petrine" sees of Rome, Alexandria and Antioch had a real patriarchal function. The canons of the Quinisext Council of 692, which gave ecclesiastical sanction to Justinian's decree, were also never fully accepted by the Western Church. Early Muslim conquests of the territories of the patriarchates of Alexandria, Antioch and Jerusalem, most of whose Christians were in any case lost to the orthodox church since the aftermath of the Council of Chalcedon, left in effect only two patriarchates, those of Rome and Constantinople. In 732, Emperor Leo the Isaurian, Leo III's Byzantine iconoclasm, iconoclast policies were resisted by
Pope Gregory III Pope Gregory III (; died 28 November 741) was the bishop of Rome from 11 February 731 to his death on 28 November 741. His pontificate, like that of his predecessor, was disturbed by Byzantine iconoclasm and the advance of the Lombards, in which ...
. The Emperor reacted by transferring to the ecclesiastical jurisdiction of Constantinople in 740 the territories in Greece, Illyria, Sicily and Calabria that had been under Rome (see map), leaving the bishop of Rome with only a minute part of the lands over which the empire still had control. The Patriarch of Constantinople had already adopted the title of "ecumenical patriarch", indicating what he saw as his position in the ''oikoumene'', the Christian world ideally headed by the emperor and the patriarch of the emperor's capital. Also under the influence of the Caesaropapism, imperial model of governance of the state church, in which "the emperor becomes the actual executive organ of the universal Church", the pentarchy model of governance of the state church regressed to a monarchy of the Patriarch of Constantinople.


Rise of Islam

The Rashidun conquests began to expand the sway of
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 ...
beyond Arabia in the 7th century, first Byzantine–Arab Wars, clashing with the Roman Empire in 634. That empire and the Sassanid Persian Empire were at that time crippled by Byzantine–Sassanid War of 602–628, decades of war between them. By the late 8th century the Umayyad caliphate had conquered all of Muslim conquest of Persia, Persia and much of the Byzantine Empire, Byzantine territory including Roman Egypt, Egypt, Roman Palestine, Palestine, and Roman Syria, Syria. Suddenly, much of the Christian world was under Muslim rule. Over the coming centuries the successive Muslim states became some of the most powerful in the Mediterranean world. Though the Byzantine church claimed religious authority over Christians in Egypt and the Levant, in reality the majority of Christians in these regions were by then miaphysites and members of other sects. The new Muslim rulers, in contrast, offered religious tolerance to Christians of all sects. Additionally subjects of the Muslim Empire could be accepted as Muslims simply by declaring a belief in a single deity and reverence for Muhammad (see shahada). As a result, the peoples of Egypt, Palestine and Syria largely accepted their new rulers and many declared themselves Muslims within a few generations. Muslim incursions later found success in parts of Europe, particularly Spain (see Al-Andalus).


Expansion of Christianity in Europe

During the Christianity in the 9th century, 9th century, the Emperor in Constantinople encouraged missionary expeditions to nearby nations including the Muslim caliphate, and the Turkic peoples, Turkic Khazars. In 862 he sent Saints Cyril and Methodius to Slavic peoples, Slavic Great Moravia. By then most of the Slavic population of First Bulgarian Empire, Bulgaria was Christian and Tsar Boris I of Bulgaria, Boris I himself was baptized in 864. Serbia was accounted Christian by about 870. In early 867 Patriarch Photios I of Constantinople wrote that Christianity was accepted by the Kievan Rus', which however was definitively Christianized only at the close of the following century. Of these, the Church in Great Moravia chose immediately to link with Rome, not Constantinople: the missionaries sent there sided with the Pope during the Photian Schism (863–867). After decisive victories over the Byzantines at Battle of Acheloos, Acheloos and Battle of Katasyrtai, Katasyrtai, Bulgaria declared its church autocephalous and elevated it to the rank of patriarchate, an autonomy recognized in 927 by Constantinople, but abolished by Emperor Basil II Bulgaroktonos (the Bulgar-Slayer) after his 1018 conquest of Bulgaria. In Serbia, which became an independent kingdom in the early 13th century, Stephen Uroš IV Dušan of Serbia, Stephen Uroš IV Dušan, after conquering a large part of Byzantine territory in Europe and assuming the title of Tsar, raised the Serbian archbishop to the rank of patriarch in 1346, an autonomy recognized in 1375 by Constantinople, a rank maintained until after the fall of the Byzantine Empire to the Turks. No Byzantine emperor ever ruled Russian Christendom. Expansion of the church in western and northern Europe began much earlier, with the conversion of the Irish in the Christianity in the 5th century, 5th century, the Franks at the end of the same century, the Arian Visigoths in Spain soon afterwards, and the English at the end of the Christianity in the 6th century, 6th century. By Christianity in the 9th century, the time the Byzantine missions to central and eastern Europe began, Christian western Europe, in spite of losing most of Spain to Islam, encompassed Germany and part of Scandinavia, and, apart from the south of Italy, was independent of the Byzantine Empire and had been almost entirely so for centuries. This situation fostered the idea of a universal church linked to no one particular state. Long before the Byzantine Empire came to an end, Christianization of Poland, Poland also, History of Christianity in Hungary, Hungary and other central European peoples were part of a church that in no way saw itself as the empire's church and that, with the East-West Schism, had even ceased to be in communion with it.


East–West Schism (1054)

With the defeat and death in 751 of the last Exarchate of Ravenna, Exarch of Ravenna and the end of the Exarchate, Rome ceased to be part of the Byzantine Empire. Forced to seek protection elsewhere, the popes turned to the Franks and, with the coronation of
Charlemagne Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
by
Pope Leo III Pope Leo III (; died 12 June 816) was bishop of Rome and ruler of the Papal States from 26 December 795 to his death on 12 June 816. Protected by Charlemagne from the supporters of his predecessor, Adrian I, Leo subsequently strengthened Charlem ...
on 25 December 800, transferred their political allegiance to a rival Roman emperor. Disputes between the see of Rome, which claimed authority over all other sees, and that of Constantinople, which was now without rival in the empire, culminated perhaps inevitably in mutual excommunications in 1054. Communion with Constantinople was broken off by European Christians with the exception of those ruled by the empire (including the Bulgarians and Serbs) and of the fledgling Kievan Rus', Kievan or Russian Church, then a metropolitan bishop, metropolitanate of the patriarchate of Constantinople. This church Jonah of Moscow, became independent only in 1448, just five years before the extinction of the empire, after which the Ottoman Turks, Turkish authorities included all their Orthodox Christian subjects of whatever ethnicity in a single ''Millet (Ottoman Empire)#Orthodox Christians, millet'' headed by the Patriarch of Constantinople. The Westerners who set up Crusader states in Greece and the Middle East appointed Latin Church, Latin (Western) patriarchs and other hierarchs, thus giving concrete reality and permanence to the schism. Efforts were made in 1274 (Second Council of Lyon) and 1439 (Council of Florence) to restore communion between East and West, but the agreements reached by the participating eastern delegations and by the emperor were rejected by the vast majority of Byzantine Christians. In the East, the idea that the Byzantine emperor was the head of Christians everywhere persisted among churchmen as long as the empire existed, even when its actual territory was reduced to very little. In 1393, only 60 years before the fall of the capital, Patriarch Antony IV of Constantinople wrote to Basil I of Muscovy defending the liturgical commemoration in Russian churches of the Byzantine emperor on the grounds that he was "emperor (βασιλεύς) and autokrator of the Romans, that is ''of all Christians''". According to Patriarch Antony, "it is not possible among Christians to have a Church and not to have an emperor. For the empire and the Church have great unity and commonality, and it is not possible to separate them", and "the holy emperor is not like the rulers and governors of other regions".


Legacy

Following the schism between the Eastern and Western churches, various emperors sought at times but without success to reunite Christendom, invoking the notion of Christian unity between East and West in an attempt to obtain assistance from the pope and Western Europe against the Muslims who were gradually conquering the empire's territory. But the period of the Western Crusades against the Muslims had passed before even the first of the two reunion councils was held. Even when persecuted by the emperor, the Eastern Church, George Pachymeres said, "counted the days until they should be rid not of their emperor (for they could no more live without an emperor than a body without a heart), but of their current misfortunes". The church had come to merge psychologically in the minds of the Eastern bishops with the empire to such an extent that they had difficulty in thinking of Christianity without an emperor. In Western Europe, on the other hand, the idea of a universal church linked to the Emperor of Constantinople was replaced by that in which the Roman see was supreme. "Membership in a universal church replaced citizenship in a universal empire. Across Europe, from Italy to Ireland, a new society centered on Christianity was forming." The Catholic Church, Western Church came to emphasize the term ''Catholic'' in its identity, an assertion of universality, while the Eastern Orthodox Church, Eastern Church came to emphasize the term ''Orthodox'' in its identity, an assertion of holding to the true teachings of Jesus. Both churches claim to be the unique continuation of the previously united state-sanctioned Chalcedonian and Nicene Church, whose core doctrinal formulations have been retained also by many of the churches that emerged from the Protestant Reformation, including Lutheranism and Anglicanism.


See also

* Arian controversy * Caesaropapism *
Chalcedonian Christianity Chalcedonian Christianity is the branches of Christianity that accept and uphold theological resolutions of the Council of Chalcedon, the fourth ecumenical council, held in AD 451. Chalcedonian Christianity accepts the Christological Definiti ...
* Christian state * Early Christianity * History of the Eastern Orthodox Church * History of Oriental Orthodoxy * History of the Roman Catholic Church, History of Roman Catholicism


Notes


References


Literature

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * {{DEFAULTSORT:State Church Of The Roman Empire 380s establishments in the Roman Empire Christianity in late antiquity Christianity in the Byzantine Empire Christianity in the Roman Empire