In the early fourth century AD, the Roman government ended its official persecution of Christians and introduced a policy of religious toleration. The process began with an edict issued by Emperor Galerius in AD 311 and was strengthened by an agreement between Constantine and Licinius in AD 313. Christianity became a lawful religion, confiscated property was restored and Roman subjects were permitted to worship according to their own beliefs. These decisions transformed the relationship between the Roman state and Christianity.
Religion in the Roman World
The Roman Empire contained an enormous variety of religious traditions. Communities worshipped Roman, Greek, Egyptian, Celtic, Syrian and many other gods.
Roman religion was generally able to accept new deities and rituals. People could honour several gods without believing that only one religion was true.
Local communities continued worshipping ancestral gods after becoming part of the empire. Roman officials were usually more concerned with public order and political loyalty than with imposing identical beliefs.
This flexibility allowed religious traditions to mix. A local god might be identified with a Roman deity, while merchants and soldiers introduced cults into new regions.
Religion and the Roman State
Religion was closely connected with Roman government. Public sacrifices and festivals were believed to preserve the peace between the community and the gods.
Magistrates performed religious duties, priests supervised ceremonies and armies conducted sacrifices before military campaigns.
Romans believed that neglecting the gods could bring defeat, famine, disease or political disorder. Religious participation was therefore considered a public responsibility rather than merely a private choice.
Refusing to take part could be interpreted as rejection of the community and its traditions.
The Imperial Cult
The imperial cult honoured the emperor, members of his family and the power of Rome. It took different forms throughout the provinces.
In some regions, deceased emperors were worshipped as gods. In others, sacrifices honoured the living emperor’s protective spirit or the authority of the Roman state.
Participation expressed loyalty as well as religious devotion. Local elites sponsored temples and festivals to demonstrate their relationship with imperial power.
For many people, honouring the emperor did not prevent the worship of other gods. Christians, however, regarded sacrifice to the emperor as incompatible with devotion to one God.
Judaism and Roman Rule
Judaism was an ancient monotheistic religion that rejected the worship of other gods. Jewish communities existed throughout the Roman world.
Roman authorities often granted Jewish communities exemptions from religious duties that conflicted with their beliefs. Jews could offer prayers for the emperor without sacrificing to him as a god.
Relations were not always peaceful. Political and religious tensions contributed to major revolts in Judaea during the first and second centuries AD.
Rome destroyed the Jerusalem Temple in AD 70 and later restricted some Jewish practices. Even so, Judaism continued as a recognised religious tradition.
The Growth of Christianity
Christianity began in Roman Judaea during the first century AD. Its earliest followers believed that Jesus of Nazareth was the Messiah and had risen from the dead.
Christian missionaries carried the new faith to cities throughout the eastern Mediterranean and eventually across the empire.
Christian communities attracted people from different social backgrounds. They met for worship, shared meals, supported poorer members and preserved teachings through letters and sacred texts.
By the early fourth century, Christianity had become a significant religious movement. Its distribution was uneven, but churches existed in most provinces and many major cities.
Why Christians Faced Suspicion
Christians worshipped one God and refused sacrifices to traditional deities. Their refusal appeared dangerous to people who believed public worship protected the empire.
They were sometimes accused of disloyalty because they would not participate fully in the imperial cult. Private meetings also encouraged rumours about secret and immoral rituals.
Christian claims that other gods were false distinguished them from worshippers who accepted several cults at once.
Periods of disease, war or disaster could produce demands that Christians prove their loyalty by sacrificing for Rome’s safety.
Early Persecutions
Christian persecution was not continuous throughout the first three centuries. Its intensity depended upon time, place and the decisions of individual officials.
Emperor Nero punished Christians in Rome after the Great Fire of AD 64. This action appears to have been local rather than an empire-wide policy.
Later governors sometimes prosecuted Christians when accusations were formally presented. Refusal to sacrifice could lead to imprisonment or execution.
At other times, Christian communities worshipped with limited interference. Periods of repression alternated with decades of relative peace.
Trajan’s Policy
During the reign of Trajan, the governor Pliny the Younger asked how he should deal with Christians in Bithynia.
Trajan replied that Christians should not be actively hunted. Anonymous accusations were not to be accepted.
However, people formally accused and proven to be Christians could be punished if they refused to worship the Roman gods. Those who sacrificed were to be released.
This policy was neither full toleration nor systematic persecution. It treated Christianity as punishable under certain circumstances while discouraging aggressive searches.
The Persecution Under Decius
In AD 249, Decius became emperor during a period of military and political danger. He ordered inhabitants of the empire to perform sacrifices for the welfare of Rome.
People who complied could receive certificates confirming that they had sacrificed. Surviving papyri preserve examples of these documents.
Christians who refused faced imprisonment, torture or execution. Some abandoned their faith, while others obtained certificates without performing the ritual.
The crisis created internal disputes within Christian communities about whether those who had complied could later return to the Church.
The Persecution Under Valerian
Emperor Valerian introduced further measures against Christians during the AD 250s. Church leaders were targeted, and Christian property could be confiscated.
Several prominent Christians were executed, including Cyprian, bishop of Carthage.
After Valerian was captured by the Persian Empire, his son Gallienus ended the persecution. Confiscated places of worship were restored.
Christians then experienced several decades of comparative peace and institutional growth.
Diocletian and Religious Unity
Diocletian became emperor in AD 284 and restored political stability after the Crisis of the Third Century. He reorganised the empire under a system of four rulers known as the Tetrarchy.
The Tetrarchs connected their authority with traditional Roman gods. Diocletian associated himself with Jupiter, while Maximian was linked with Hercules.
They believed that religious unity supported political and military order. Groups that rejected traditional worship could therefore appear to threaten the restored empire.
Christians in the Imperial Government
Before the Great Persecution, Christians served in the army, imperial household and civil administration. Churches owned property and operated openly in several cities.
This visibility demonstrated Christianity’s growth but made the religion easier for officials to target.
Some Christians refused military ceremonies or sacrifices connected with public office. Their actions created conflicts between religious conscience and imperial expectations.
The Great Persecution
In AD 303, Diocletian and his colleagues began the most extensive official persecution of Christians in Roman history.
The first edict ordered churches to be destroyed and Christian scriptures surrendered. Christians could lose legal rights and positions within the government.
Later measures ordered the imprisonment of clergy and required inhabitants to perform sacrifice. Refusal could result in torture or death.
The policy was enforced differently across the empire. It was particularly severe in parts of the east, while Constantius Chlorus limited its application in his western territories.
Christian Responses
Some Christians surrendered scriptures or complied with orders to sacrifice. Others escaped, hid or relied upon sympathetic neighbours and officials.
Those who refused could be imprisoned, tortured or executed. Christian communities preserved accounts of martyrs who chose death rather than abandon their faith.
The persecution created disagreements about how the Church should treat people who had cooperated with the authorities. These disputes continued after toleration was granted.
Despite years of repression, the government failed to eliminate Christianity.
The Failure of Persecution
The Roman state could destroy buildings, seize books and execute leaders, but Christian communities continued operating. New leaders replaced those who had been killed.
Martyr stories strengthened group identity and presented suffering as evidence of faith. Executions could inspire admiration rather than fear.
Enforcement required the cooperation of governors, soldiers and local officials, many of whom applied the orders inconsistently.
By AD 311, Galerius recognised that the policy had failed to restore traditional religious unity.
Galerius’s Edict of Toleration
In April AD 311, Emperor Galerius issued an Edict of Toleration from Nicomedia. Galerius had previously been closely associated with the persecution.
The edict admitted that attempts to force Christians back to traditional worship had not succeeded. Many Christians had refused to honour either the Roman gods or their own God publicly.
Galerius allowed Christians to exist again and rebuild their places of assembly, provided they did nothing against public order.
He asked Christians to pray to their God for the emperor, the state and themselves. This request transformed Christian prayer from a suspicious activity into a service benefiting Rome.
The Significance of Galerius’s Decision
The edict did not declare Christianity superior to other religions. It recognised that coercion had failed and that toleration could better preserve political stability.
Christian worship became lawful in territories controlled by Galerius and participating emperors. The government no longer demanded universal religious conformity through persecution.
Galerius died only a few days after issuing the edict. Christian writers sometimes interpreted his final illness and policy change as divine punishment and reluctant surrender.
Whatever his personal motives, his edict marked the formal end of the Great Persecution.
Constantine’s Rise
Constantine was the son of Constantius Chlorus, one of Diocletian’s tetrarchs. After Constantius died in Britain in AD 306, his soldiers proclaimed Constantine emperor.
Several rival rulers claimed authority during the collapse of the Tetrarchic system. Constantine gradually gained control of Gaul, Britain and Spain.
In AD 312, he invaded Italy and confronted Maxentius, who controlled Rome and much of the central Mediterranean.
The Battle of the Milvian Bridge
Constantine defeated Maxentius at the Battle of the Milvian Bridge near Rome on 28 October AD 312.
Christian writers claimed that Constantine received a divine sign before the battle. One account described a dream instructing him to place a Christian symbol on his soldiers’ shields.
Another described a vision of a cross of light above the sun accompanied by a promise of victory. The accounts differ and were written after the event.
Constantine’s victory gave him control of the western empire. He increasingly associated his success with the Christian God.
Constantine and Licinius Meet at Milan
In early AD 313, Constantine met Licinius at Mediolanum, the modern city of Milan. Licinius controlled much of the eastern empire.
The two emperors arranged a political alliance strengthened by Licinius’s marriage to Constantine’s half-sister Constantia.
They also agreed upon a broad policy of religious freedom. A surviving letter sent by Licinius to provincial officials later that year preserves the substance of their decision.
The Edict of Milan
The agreement is traditionally called the Edict of Milan. It may not have existed as a single formal edict issued at Milan, but the name remains widely used.
The policy granted Christians and all other people freedom to follow whichever religion they chose. Religious liberty was presented as a way of securing divine favour for the emperors and the state.
Christianity was no longer merely tolerated as an exception. It received the same legal freedom promised to other forms of worship.
The agreement did not make Christianity the official religion of the Roman Empire.
Restoration of Christian Property
The policy ordered the return of property confiscated during the persecution. Churches, meeting places and other possessions were to be restored without payment.
People who had purchased former Christian property could apply to the government for compensation. This prevented restoration from becoming a punishment against current possessors.
Property was returned to Christian communities as organised legal bodies. This recognised that churches could own buildings and resources collectively.
Restitution allowed Christian communities to rebuild rapidly after the persecution.
Toleration for All Religions
The agreement between Constantine and Licinius was expressed as a policy applying to Christians and everyone else. Individuals were to choose their form of worship freely.
The language did not depend upon a modern idea that religion should be separated from government. The emperors still believed divine favour was essential to Rome’s security.
Toleration was intended to allow every divine power to support the emperors and their subjects. Religious freedom served the stability of the state.
Christianity Becomes a Favoured Religion
Although the policy promised general toleration, Constantine soon gave Christianity important advantages. He returned church property and provided financial support for Christian communities.
Clergy received exemptions from certain public obligations. These privileges allowed them to concentrate on religious service but placed additional burdens on other citizens.
Constantine sponsored the construction of major churches, including buildings in Rome and Jerusalem. Imperial patronage gave Christianity a new public visibility.
The religion had moved rapidly from persecution to legal protection and government favour.
Constantine’s Personal Beliefs
Constantine’s religious development was gradual and complex. After AD 312, he increasingly supported Christianity and credited the Christian God with his victories.
He continued using some traditional religious titles and imagery during the earlier part of his reign. Roman coins did not immediately abandon every connection with the sun god and older traditions.
Constantine involved himself deeply in Church affairs, built places of worship and summoned councils of bishops. He was baptised near the end of his life in AD 337.
Delayed baptism was not necessarily evidence of insincerity. Some Christians postponed baptism because they believed it removed earlier sins and feared committing serious offences afterwards.
Licinius and Christianity
Licinius initially implemented the policy of toleration in the eastern provinces. Christians regained property and resumed public worship.
As relations with Constantine deteriorated, Christian writers accused Licinius of renewed hostility towards the Church. He restricted some Christian activities and removed Christians from certain positions.
The extent of a systematic new persecution is debated. Accounts written under Constantine had political reasons to portray Licinius as an enemy of Christianity.
Constantine defeated Licinius in AD 324 and became sole ruler of the Roman Empire.
The Limits of Religious Freedom
The toleration established in AD 313 did not create unlimited freedom in the modern sense. The emperor remained closely involved in religious affairs.
Practices regarded as magical, treasonous or harmful could still be prohibited. Religious activity was acceptable only while it remained compatible with public order and imperial authority.
Traditional worship continued, but Constantine restricted some sacrifices and temple practices. The extent and enforcement of these measures varied.
The state had ended the persecution of Christianity, but it had not abandoned the belief that emperors should supervise religion.
Division Within Christianity
Legalisation revealed serious disagreements among Christians. Communities disputed theology, authority and the treatment of believers who had cooperated with persecutors.
In North Africa, the Donatist controversy divided Christians over whether clergy who had surrendered scriptures could perform valid religious ceremonies.
Both sides appealed to Constantine. The emperor ordered bishops to investigate and later used state power against the group identified as schismatic.
The dispute demonstrated that toleration for Christianity did not guarantee toleration between competing Christian communities.
The Council of Nicaea
A major theological dispute developed over the relationship between Jesus Christ and God the Father. Arius, a priest in Alexandria, taught views opposed by his bishop and other church leaders.
Constantine summoned bishops to the Council of Nicaea in AD 325. The council attempted to create agreement and produced a statement of faith that became the foundation of the Nicene Creed.
The emperor attended the council and encouraged unity. His involvement established an important precedent for imperial participation in Christian theological disputes.
Religious toleration had allowed the Church to operate openly, but imperial favour brought it into a close and sometimes difficult relationship with political power.
Traditional Religion After AD 313
Traditional Roman and local religions did not disappear after Christianity became legal. Temples, sacrifices and festivals continued throughout the empire.
Many officials and senators remained devoted to traditional worship. Rural and urban communities maintained ceremonies connected with local identity.
Constantine did not order the immediate closure of every temple. His policies combined Christian patronage with selective restrictions and political caution.
The fourth century was therefore a long period of religious change rather than an instant conversion of the entire empire.
Judaism Under Christian Emperors
Jewish communities remained legally recognised after AD 313. Synagogues and communal institutions continued to operate.
Christian emperors introduced restrictions intended to prevent conversion to Judaism or protect Christian interests. Some laws limited Jewish ownership of Christian enslaved people.
At other times, imperial law protected synagogues from attack. Policy combined recognition with growing discrimination.
As Christianity gained power, theological hostility towards Judaism increasingly influenced Roman legislation and public attitudes.
Religious Buildings and Public Space
Before toleration, Christians often met in private houses or buildings adapted for worship. Imperial support allowed them to construct monumental churches.
The basilica became a common architectural form for Christian worship. Its large interior could accommodate congregations and ceremonies.
Churches built in Rome, Constantinople, Jerusalem and other cities transformed the appearance of public religion. Christian worship became visible at the centre of imperial life.
These buildings also demonstrated the wealth and authority of bishops and imperial patrons.
Christian Clergy and Government
Bishops became increasingly important community leaders. They managed church property, distributed charity and judged disputes among Christians.
Constantine allowed episcopal courts to hear certain cases. This gave bishops a recognised role within the broader legal system.
Imperial privileges increased the Church’s resources and responsibilities. They also made senior religious appointments politically significant.
The alliance between emperors and bishops could protect communities, but it could also allow government pressure to shape religious decisions.
Charity and Social Support
Christian churches organised assistance for widows, orphans, prisoners, travellers and poorer members. Legal recognition allowed these networks to expand.
Wealthy converts donated money, land and buildings. Bishops administered resources on behalf of their communities.
Christian charity did not replace all traditional forms of public generosity. Emperors, officials and local elites continued sponsoring food distributions, games and civic construction.
The growth of Church welfare strengthened its position within urban society.
Constantinople and the Christian Emperor
Constantine established a new imperial capital at Byzantium, renamed Constantinople. The city was dedicated in AD 330.
Constantinople contained Christian churches alongside monuments connected with Roman tradition. It presented Constantine as the founder of a renewed imperial centre.
The city’s position connected Europe and Asia and provided access to important military and commercial routes.
Later emperors made Constantinople increasingly Christian in appearance and ceremony.
From Toleration to Imperial Christianity
Constantine’s successors continued supporting Christianity, although policies varied. Some favoured different theological groups, while Emperor Julian attempted to revive traditional worship.
Julian did not restore the earlier persecution of Christians on the same scale. He removed some privileges and tried to rebuild pagan institutions capable of competing with the Church.
After Julian’s death, Christian emperors again controlled the empire. The connection between imperial government and Christianity became progressively stronger.
The Edict of Thessalonica
In AD 380, Emperor Theodosius I and his colleagues issued the Edict of Thessalonica. It declared Nicene Christianity the form of religion approved by the imperial government.
This decision differed significantly from the broad toleration expressed in AD 313. The state now supported a particular Christian doctrine.
Other Christian groups were labelled heretical and could face restrictions. Traditional religious practices also came under increasing pressure.
Christianity had moved from a persecuted religion to a legally tolerated faith, then to the religion favoured and enforced by emperors.
The Decline of Traditional Public Worship
During the later fourth century, emperors restricted sacrifices and withdrew some public support from traditional cults. Temples lost income and official functions.
The process varied between regions. Some temples closed, while others were converted, abandoned or continued operating for decades.
Violent confrontations occurred in certain places, but much religious change happened gradually through legislation, social pressure and the loss of patronage.
Traditional beliefs did not disappear immediately. They continued privately and publicly into the later Roman period.
Was the Edict of Milan Modern Religious Liberty
The policy of AD 313 is sometimes described as the beginning of freedom of religion. It did establish an important principle that people should be able to choose their form of worship.
Its purpose, however, differed from modern secular ideas. Constantine and Licinius wanted divine support and political stability, not a permanent separation between religion and government.
Emperors continued to regulate belief, sponsor favoured groups and suppress practices they considered dangerous.
The agreement was therefore a major act of toleration without creating complete or lasting religious equality.
The Importance of Property Restitution
The return of Christian property was essential to the success of toleration. Religious freedom would have meant little if congregations remained deprived of their buildings and resources.
Restitution recognised churches as organised communities capable of possessing property. This strengthened their legal and institutional position.
Government compensation for current possessors attempted to prevent restoration from producing additional conflict.
The policy demonstrated that religious toleration required practical legal action rather than a simple declaration of principle.
Political Motives
Constantine’s support for toleration may have reflected personal belief, political calculation and a desire for divine favour. These motives were not necessarily separate in the ancient world.
Christians formed organised communities across the empire and could provide valuable support. Ending persecution also distinguished Constantine from rivals associated with the Tetrarchic system.
Religious peace allowed the government to focus upon military defence and political reunification.
Constantine’s later actions suggest a genuine commitment to Christianity, although his policies consistently served imperial unity as well.
The Christian Interpretation
Christian writers viewed the end of persecution as a victory granted by God. Constantine appeared as a ruler chosen to protect the Church.
The historian Eusebius presented his victories and policies as part of a divine plan. This interpretation strongly influenced later accounts.
Christian narratives sometimes simplified the gradual and politically complicated process that produced toleration. Galerius’s earlier edict received less attention than Constantine’s actions.
Both AD 311 and AD 313 were essential stages in ending official persecution.
The Legacy of Galerius
Galerius is often remembered primarily as a persecutor, but his final edict was historically important. It acknowledged that religious coercion had failed.
By allowing Christians to gather and pray for the state, he established a legal basis for their continued existence.
His decision did not provide every protection later associated with the agreement at Milan. It nevertheless opened the path from persecution towards legal recognition.
The Legacy of Constantine
Constantine transformed Christianity’s place within Roman society. He gave it property, privileges, public buildings and access to imperial authority.
His policy allowed the Church to expand openly and develop institutions that survived the Western Roman Empire.
He also established a close relationship between political rule and Christian leadership. This connection shaped both the empire and the Church for centuries.
Constantine did not create Christianity, determine all its beliefs or convert every Roman subject. His importance came from making imperial government a powerful supporter of the religion.
The Historical Importance of Religious Toleration
The religious settlement of the early fourth century ended the Roman state’s most determined attempt to destroy Christianity. A faith that had faced imprisonment and execution could now own property and worship publicly.
The policy reflected the empire’s long tradition of religious diversity while responding to the failure of forced conformity.
Toleration brought immediate relief to Christian communities, but it did not create permanent equality among religions. Imperial favour soon changed the balance of power.
Within less than seventy years, the government moved from tolerating Christianity to officially supporting Nicene Christianity above competing beliefs.
The decisions of Galerius, Constantine and Licinius therefore marked both an end and a beginning. They ended the Great Persecution and began the transformation of the Roman Empire into a Christian state.