Christianity in Iran

A Christian civilization before the Islamic conquest

Christianity in Iran is not the story of a foreign religion arriving in an already Islamic country. It predates Islam by centuries. Christian communities were established in the Persian world during the Parthian and Sasanian periods, and by late antiquity Christianity possessed bishops, monasteries, schools, clergy and organized communities across a wide geographical area. The Church of the East developed much of its institutional identity within the Persian Empire and would eventually become one of the great missionary churches of world Christianity, extending far beyond Iran into Central Asia, India and China.

Life under the Sasanian Empire was not consistently peaceful. Christianity existed within a state whose official religious tradition was Zoroastrian, and relations between Christians and the government could become dangerous when religion became entangled with imperial rivalry. After the Roman Empire embraced Christianity, Persian Christians could be suspected of sympathy with Rome. Under Shapur II, beginning in the fourth century, this suspicion contributed to one of the most severe persecutions in Persian Christian history.

Christians were subjected to punitive taxation, arrest and imprisonment. Bishops, priests and lay believers were executed, and Christian sources preserve accounts of torture and martyrdom. The persecution continued for decades and left a deep memory within the Persian church. Yet Christianity was not eradicated. Later Sasanian rulers permitted greater institutional stability, and the Persian church became increasingly organized and independent of the Roman Christian world.

By the beginning of the seventh century, therefore, Christianity was an indigenous and deeply rooted part of Persian civilization. It had survived persecution, developed its own hierarchy and spread across the empire. That is the world that encountered the Arab-Muslim conquests.

The Arab-Muslim conquest

The transformation of Iran from a predominantly Zoroastrian empire containing substantial Christian communities into an Islamic civilization began with military conquest.

In the 630s, armies of the emerging Islamic caliphate invaded Sasanian territory. This was not a peaceful religious transition. It was a succession of battles, sieges and campaigns that destroyed Sasanian military resistance and eventually the empire itself. Soldiers were killed, populations were captured, tribute arrangements were imposed and Iranian captives were carried into territories controlled by the conquerors.

Christians were not the principal target of the invasion. The conquering armies were fighting the Sasanian state, and the empire's population included Zoroastrians, Christians, Jews and adherents of other religions. Some Christians, exhausted by decades of Byzantine-Sasanian warfare and heavy Sasanian taxation, reportedly welcomed the Arab conquerors. Christianity was therefore not extinguished by the conquest, and Christian communities initially continued to function.

But the political meaning of the conquest was profound. The Sasanian order under which the Persian church had developed disappeared. Political supremacy now belonged to an Islamic state.

By 651 the Sasanian Empire had collapsed. Persian Christians had survived the conquest, but they now lived within a civilization whose governing religion was Islam.

That distinction is essential. The Islamic conquest did not immediately destroy Persian Christianity. It changed the political, legal and social conditions under which Christianity would have to survive.

From conquest to subordinate status

Christians, like Jews, were generally classified under Islamic rule as People of the Book. They could retain their religion and communal institutions as protected non-Muslims. Churches continued to exist. Bishops continued to lead communities. Christian scholarship survived, and in some places Christianity experienced a period of expansion during the first centuries after the conquest.

Protection, however, did not mean religious equality.

Christians occupied a legally differentiated position beneath the Muslim political and religious order. Eligible non-Muslims could be required to pay the jizya poll tax. At different periods governments imposed rules distinguishing non-Muslims through clothing or other public markers, and Christian communities could experience restrictions or humiliating regulations. Enforcement varied greatly by ruler, dynasty, locality and century, but the underlying hierarchy was clear: Islam occupied the privileged position of the state, while Christianity was a tolerated minority religion.

This distinction matters when considering the eventual demographic transformation of Iran.

There is no credible basis for claiming that the Muslim conquerors simply forced the entire Christian population to convert at sword point. Islamization took centuries. People converted for many reasons: religious conviction, marriage, cultural assimilation, political opportunity and participation in the increasingly Muslim society.

But those choices did not occur in a neutral environment.

Conversion to Islam could remove the fiscal burden associated with non-Muslim status and improve a person's social and political position. Early Islamic authorities at times explicitly used relief from poll taxation as an incentive for conversion. A Christian family therefore lived within a system in which remaining Christian could carry disadvantages that becoming Muslim could remove.

Over generations, those differences mattered.

The process was gradual rather than instantaneous: conquest established Muslim political supremacy; Islamic law established differentiated status; conversion and assimilation then altered the religious composition of society over centuries.

Christianity survived, but the broad Christian geography of late antique Persia slowly contracted.

Islamization without a single moment of disappearance

The decline of Persian Christianity cannot be represented honestly by drawing a straight line from the conquest of 651 to the small Christian population of modern Iran. For centuries after the conquest, Christian communities remained intellectually and institutionally important.

The Church of the East continued to produce bishops, theologians and missionaries. Persian Christians participated in the intellectual life of the Islamic world. Christian physicians, translators and scholars contributed to the transmission of Greek learning into Arabic. Christianity remained visible enough for Muslim writers to engage Christian theology in polemical literature.

At the same time, the demographic balance continued to move toward Islam.

This was not one continuous campaign of massacre. There were periods of relative security and periods of persecution. There were rulers who protected Christians and rulers who imposed harsher restrictions. There were voluntary conversions and conversions influenced by the material advantages attached to Muslim status. There were communities that prospered and others that disappeared.

The cumulative result nevertheless mattered. A religion that had once possessed communities spread throughout the Persian world increasingly survived in particular regions and ethnic populations.

By the later medieval period, political instability and renewed religious repression accelerated that contraction.

Mongol rule and the reversal under Ghazan

The Mongol conquest initially created an unusual period for Persian Christians. Some members of the Mongol elite had Christian connections, particularly through eastern Christian traditions, and Christians at times enjoyed significant favor at court.

That position changed dramatically when the Ilkhan Ghazan converted to Islam in 1295.

Ghazan's conversion established Islam much more firmly at the centre of Ilkhanid political identity. A campaign against non-Muslims followed. Christian sources and modern scholarship record destruction of churches and synagogues, humiliation of Christian communities and excessive taxation. Under later Ilkhanid rulers, Christian institutions were again vulnerable, and some convents were converted into mosques.

Ghazan eventually moderated aspects of the persecution, and conditions were not uniformly violent throughout his reign. Nevertheless, the change illustrates a recurring pattern in Iranian Christian history: a community could exist relatively securely under one political arrangement and then find its status transformed when rulers connected political legitimacy more closely to Islamic religious identity.

The consequences became still more severe during the upheavals associated with Timur.

Timur and the collapse of older Christian geography

Timur's campaigns devastated enormous areas of Iran and the surrounding Middle East. Muslims themselves were among his victims on a vast scale, and his wars should not be rewritten as a campaign directed exclusively against Christianity.

For already weakened Christian communities, however, the destruction was disastrous.

Warfare, massacre, displacement and economic devastation destroyed the conditions that allowed small communities to survive. Around Lake Urmia and elsewhere, Christian settlement contracted sharply. By the fifteenth century Christianity had disappeared from many regions where eastern Christian communities had existed for centuries.

This period illustrates another mechanism by which Christian civilization declined. A minority need not be subjected to a single formal extermination order to disappear. Once communities have been reduced by centuries of conversion and demographic attrition, warfare and repeated displacement can destroy the remaining institutions necessary for survival.

After the medieval upheavals, Christianity in Iran increasingly became concentrated among particular Armenian and Assyrian populations.

The rise of the Safavid Empire would bring those communities into a new and often contradictory relationship with an explicitly Shiʿi Islamic state.

The Safavid transformation

When the Safavid dynasty established Shiʿi Islam as the defining religion of the Iranian state in the sixteenth century, religious identity became closely connected to political authority.

Christians remained recognized non-Muslim subjects, but their security depended heavily upon the policies of individual rulers and upon the economic or diplomatic usefulness of their communities.

The most dramatic example came under Shah Abbas I.

During his war with the Ottoman Empire in 1604, Shah Abbas ordered a scorched-earth evacuation of the northwestern frontier. Armenian towns and villages were emptied. Crops and settlements were destroyed to deny resources to advancing Ottoman forces, and huge numbers of inhabitants were forcibly deported into the Iranian interior.

Old Julfa was demolished. Its Armenian population was compelled to cross the Aras River and leave its homeland.

This was not voluntary migration.

Families were uprooted from ancestral communities. Homes, farms and local economies were lost. The journey itself caused death and extreme suffering. People were separated from the landscapes, churches and cemeteries that had defined their communities for generations.

The deportations reveal one of the paradoxes of Christian life under Shah Abbas. The same ruler who violently uprooted Armenian populations subsequently recognized their economic value and gave some of the survivors considerable privileges.

Near Isfahan, deported Armenians established New Julfa.

New Julfa: prosperity born from forced displacement

New Julfa became one of the great Armenian commercial centres of the early modern world. Armenian merchants developed trading networks stretching through Europe, Russia, India and the Middle East. Churches were built, religious processions occurred, schools and cultural institutions developed, and wealthy merchants supported the Armenian Church.

The prosperity was genuine.

So was the coercion that had created the community.

The success of New Julfa should never be used retrospectively to transform Shah Abbas's deportation into benevolent resettlement. Armenians had been forced from their homes as part of a military scorched-earth strategy. Their subsequent achievements belonged to the displaced community, not to the violence that displaced them.

Nor did prosperity erase their unequal status.

Armenians remained Christian subjects of a Muslim state and were governed by the Islamic framework applied to protected non-Muslims. They paid jizya. The amount demanded from New Julfa increased substantially during the seventeenth century.

Under Shah Abbas II, Armenians were expelled from Isfahan proper after complaints about Christian religious and social practices. They were pushed toward New Julfa and its surrounding quarters.

At the same time, pressure for conversion increased.

Conversion, execution and economic coercion

Safavid religious coercion did not always take the form of armies forcing entire communities to convert. It could operate through execution, law, taxation, property and institutional punishment.

In 1622, five Muslim converts to Christianity were executed at Isfahan by royal command. Their deaths demonstrated one of the clearest boundaries of the system: an inherited Christian community might be tolerated, but leaving Islam for Christianity could be treated as an intolerable religious transgression.

Later in the seventeenth century, pressure on Armenians and other non-Muslims intensified.

Under Abbas II, Armenians were removed from central Isfahan. Sources describe increased pressure on Christians and Jews to accept Islam. Legal and economic incentives could reward conversion, while remaining Christian preserved the burdens associated with minority status.

Inheritance rules could make this pressure particularly personal. A family member who converted to Islam could receive advantages over Christian relatives in inheritance. Religious conversion could therefore alter who received family wealth.

The state did not need to place a sword at the throat of every Christian for religious hierarchy to influence demographic change. A legal system could make one religious identity materially advantageous and another more expensive to preserve.

The distinction between voluntary and forced conversion therefore cannot always be reduced to a simple yes-or-no category. Some conversions were unquestionably sincere and voluntary. Others occurred amid pressure created by law, taxation, social status or fear. Still others were directly coerced.

Punishing the Armenian Church

By the 1670s, the Armenian Church of New Julfa faced direct institutional punishment.

After an Armenian monk converted to Islam and made accusations against his former church, Safavid authorities imprisoned the Armenian primate and his vicar for months. Heavy fines were imposed. A newly built monastery was ordered destroyed. Church treasures were confiscated.

The authorities then imposed a punitive annual tax on the Armenian parishes of New Julfa.

These actions demonstrate how religious pressure could be applied collectively. The punishment did not fall only upon an individual accused of wrongdoing. Clergy were imprisoned, institutional property was seized and an entire Christian community was made to bear an additional financial burden.

Under Shah Soltan Hosayn, conditions became still more restrictive.

Armenians were increasingly subjected to public discrimination and humiliation. Muslim heralds announced benefits available to converts. Traveling Armenian merchants could face repeated demands for jizya. Courts more systematically applied inheritance rules favoring converts to Islam.

Some regulations reflected concepts of ritual impurity. Non-Shiʿi minorities could be prohibited from going outdoors during rain because contact with water flowing from them was considered capable of contaminating Muslims.

Such rules may appear less dramatic than massacre, but they reveal the social world in which Christian minorities lived: they could be commercially successful and institutionally organized while simultaneously being legally marked as religiously inferior.

By the early eighteenth century, New Julfa remained a remarkable Christian centre, but taxation, discrimination, political instability and emigration were weakening the community.

Qajar Iran and partial improvement

The fall of the Safavids did not end Iranian Christianity, and the nineteenth century brought periods of improved conditions.

Under the Qajars, Armenian and Assyrian Christians maintained churches and communal institutions. European and American missionary activity expanded, particularly among Assyrians around Urmia. Schools, medical institutions and printing presses appeared.

Urmia became one of the most important centres of modern Assyrian Christian intellectual life.

From the 1830s until the First World War, Christian missions helped establish printing houses and schools. Assyrian religious and literary culture flourished. The region contained ancient villages, churches and a dense Christian population with connections extending into the Ottoman territories to the west.

This revival is important because it shows that Christian decline was never an uninterrupted downward line.

By the beginning of the twentieth century, northwestern Iran still contained a vigorous Christian civilization.

Then the First World War reached it.

The destruction of the Urmia Christian world

Beginning in 1915, Ottoman military operations and associated armed violence transformed northwestern Iran into a zone of catastrophe.

Assyrian Christians fleeing persecution in Ottoman Hakkari crossed into Iran seeking safety. Iranian Assyrian and Armenian communities themselves became exposed to invasion, massacre, village destruction and displacement.

Mission compounds filled with refugees.

Christian villages were attacked. Civilians were killed. Clergy were murdered. Homes, farms and churches were abandoned or destroyed.

The violence formed part of the wider destruction of Armenian and Assyrian Christian populations across the Ottoman-Iranian borderlands. In the Assyrian tradition this catastrophe is remembered as Sayfo.

The situation became still worse in 1918 after Russian forces withdrew from the region.

The Christian population around Urmia and Salmas lost a major source of military protection. Ottoman forces advanced again, local authority collapsed and Armenian and Assyrian communities were exposed to renewed violence.

Places that people believed might offer sanctuary did not necessarily protect them.

At the Catholic mission in Urmia, thousands of Assyrians sought refuge. Clergy and civilians were killed during the massacres. The Assyrian scholar and archbishop Toma Audo, who had helped shelter refugees, was shot and subsequently died.

The killing of religious leaders accompanied the destruction of villages and the collapse of Christian communal life.

Eventually an enormous population fled south toward Hamadan.

Contemporary-linked accounts describe approximately eighty thousand people in the principal flight. That number should not be confused with a death toll. It demonstrates the extraordinary scale of displacement.

Men, women and children left homes, property and communities behind. During the wider catastrophe people died from attack, hunger, exhaustion and disease. Families were scattered. Many survivors eventually continued into Iraq or other parts of the diaspora.

The result was permanent.

Urmia had been a spiritual and intellectual centre of Assyrian Christianity. After the First World War, that concentrated Christian world never fully recovered.

The Pahlavi period

During the Pahlavi monarchy, Iran's remaining historic Christian communities generally experienced greater institutional stability.

Armenian and Assyrian churches operated openly. Christians participated in urban professional, commercial and cultural life. Constitutional minority representation continued.

Emigration nevertheless reduced the historic communities over time, and the demographic centre of Christian life shifted increasingly toward Tehran and other cities.

The Iranian Revolution of 1979 then created another fundamental change.

Christianity under the Islamic Republic

The Islamic Republic presents one of the clearest examples of why the phrase “Christians are persecuted in Iran” requires qualification.

Historic Armenian and Assyrian Christians are constitutionally recognized religious minorities. They possess churches, communal organizations and designated parliamentary representation. Armenian Apostolic worship continues openly, and Assyrian and Chaldean institutions remain part of Iranian society.

But that recognition applies principally to communities whose Christianity is inherited.

The state treats conversion from Islam very differently.

A person born Armenian Christian and a Persian Muslim who becomes Christian do not occupy equivalent positions within the religious system.

Conversion from Islam challenges a boundary the Islamic Republic regards as legally and politically significant. Apostasy may be addressed through Islamic jurisprudence, while converts and evangelical leaders are frequently prosecuted through national-security or propaganda charges.

The result is a system in which Christianity can simultaneously be a recognized minority religion and a dangerous religion to adopt.

Protestant leaders and the violence of the 1990s

After the Revolution, Protestant and Anglican institutions faced seizures, intimidation and growing surveillance. Churches ministering in Persian attracted particular suspicion because they made Christianity accessible beyond historic Armenian and Assyrian communities.

Several Christian leaders were killed.

The danger became especially visible in 1994 with the murders of evangelical leaders Haik Hovsepian Mehr, Mehdi Dibaj and Tatavous Michaelian.

The murders are established, although responsibility remains disputed. Iranian authorities attributed the killings to members of the Mujahedin-e Khalq, while later allegations raised the possibility of state-linked involvement. The evidence does not justify presenting disputed attribution as settled fact.

What is beyond dispute is the climate produced by the killings.

Persian-speaking evangelical Christianity had become dangerous. Pastors understood that evangelism among Muslims and support for converts could bring surveillance, arrest or worse.

Public Protestant life contracted while emigration increased.

House churches and the criminalization of conversion

As authorities restricted Farsi-language Christian services, converts increasingly gathered in private homes.

These house churches allowed Persian-speaking Christianity to survive outside historic ethnic churches. Small groups met for prayer, Bible study, worship and fellowship.

Security authorities responded with raids.

Homes and gatherings have been entered by security forces. Bibles, Christian literature, phones, computers and personal documents have been seized. Converts and church leaders have been arrested.

The process following arrest can itself become a form of religious coercion.

Detainees have reported prolonged interrogation, solitary confinement, threats, psychological pressure and physical abuse. Investigators may demand information about who attends Christian meetings, who leads them, where Bibles originate and who introduced particular individuals to Christianity.

The objective can extend beyond punishing one believer. Interrogation can expose an entire network.

Cases are then frequently prosecuted through Revolutionary Courts using national-security or propaganda charges.

Thus modern persecution often looks different from the public massacres of earlier centuries. It may consist of a midnight raid, confiscation of property, disappearance into detention, isolation from family, coercive questioning and years of imprisonment.

The absence of mass public execution does not make the system religiously neutral.

The Nadarkhani case

Pastor Yousef Nadarkhani became one of the best-known examples of the danger faced by Muslim-background Christians.

Nadarkhani, a Christian convert and house-church leader, was arrested in 2009. He was ultimately sentenced to death for apostasy.

His case revealed the contradiction at the heart of the Islamic Republic's treatment of Christianity. The constitution recognized Christianity, yet a person who had left Islam for Christianity could face a death sentence.

International pressure accompanied years of imprisonment and legal proceedings. The apostasy conviction was eventually overturned.

Nadarkhani survived.

The significance of the case remains.

It demonstrated that the religious boundary between Islam and Christianity was not merely theological. The state could enforce it through criminal proceedings and the threat of death.

A Christian population transformed

The Christian history of Iran cannot be understood solely by counting massacres.

The demographic transformation took place through several different mechanisms operating across nearly fourteen centuries.

The Arab-Muslim conquest destroyed the pre-Islamic political order and established Muslim rule. Christians survived but occupied a differentiated legal position. Jizya and other distinctions made Muslim and Christian status materially different. Conversion and assimilation gradually reduced Christian numbers. Periods of harsher Islamic rule added church destruction, humiliation and coercion. Safavid policies combined minority taxation with conversion incentives, discriminatory law and occasional direct persecution. Warfare and medieval devastation eliminated weakened communities from many regions.

At the same time, Christianity repeatedly revived.

New Julfa flourished after forced deportation. Urmia became a centre of Assyrian intellectual life. Armenian merchants created international networks. Churches, schools and printing presses appeared even within political systems that did not grant Christians religious equality.

Then new catastrophes changed the geography again.

The First World War shattered the Assyrian and Armenian Christian world of northwestern Iran. Twentieth-century emigration further reduced the historic communities. After 1979, the Islamic Republic preserved formal recognition for inherited Armenian and Assyrian Christianity while severely restricting conversion and Persian-speaking evangelical life.

Modern population estimates consequently present a paradox.

Official counts primarily measure recognized historic communities. Independent estimates that attempt to include Muslim-background Christians can be much higher. Because converts may worship privately and have strong reasons not to identify themselves to the state, no modern figure can be treated as perfectly precise.

What happened to Christian Iran?

Iran was never simply a Christian country that became Muslim overnight.

Before the Islamic conquest, Christianity existed alongside a predominantly Zoroastrian political civilization and had already experienced severe persecution. The Arab-Muslim conquest then created the decisive political rupture: an Islamic state replaced the Sasanian Empire.

Christianity survived that conquest.

What followed was a much longer transformation.

Muslim political supremacy became permanent. Christians lived as protected but unequal non-Muslims. Conversion to Islam could remove fiscal and social disadvantages. Over generations, conversion and assimilation changed the demographic balance. At particular moments, rulers intensified pressure through discriminatory law, church destruction, punitive taxation, expulsion or conversion policies. Warfare then destroyed some communities that had survived the earlier centuries of contraction.

The Safavid period demonstrates how complicated this process could be. Shah Abbas violently deported Armenians and destroyed their homeland along his retreat route, yet subsequently allowed deported Armenian merchants to create prosperous New Julfa. Later Safavid rulers subjected that same Christian community to heavier taxation, discrimination, clerical imprisonment and conversion pressure.

The twentieth century added another form of destruction. Ottoman wartime violence devastated Armenian and Assyrian communities around Urmia and Salmas, permanently dispersing populations that had survived centuries of earlier Islamic rule.

The Islamic Republic created still another model: inherited Christianity is recognized, while conversion from Islam can trigger surveillance, arrest and imprisonment.

There was therefore no single mechanism by which Christian civilization diminished in Iran.

There was conquest.

There was legal subordination.

There was taxation.

There were social and economic incentives to convert.

There were periods of relative tolerance.

There were periods of direct persecution.

There were forced deportations.

There was destruction of churches and Christian institutions.

There were executions.

There were massacres and mass flight.

And there was voluntary conversion and assimilation as generations increasingly lived within an Islamic civilization.

All of those processes belong in the history.

The crucial point is that Christianity did not simply fade away for unexplained reasons. Its demographic decline occurred within political and social systems created after conquest and repeatedly reshaped by subsequent Islamic governments, while war, migration and internal Christian adaptation also played major roles.

Yet Christianity endured.

Armenian churches remain in Iran. Assyrian communities continue to worship. Persian-speaking Christians meet both openly and privately. The religion that existed in Persia centuries before the birth of Islam remains present nearly two thousand years after its arrival.

That endurance is as much a part of the story as the civilization that was lost.