
The Roman Catholic Church, led by the Pope, is the largest of all branches of Christianity, with about 1.4 billion followers worldwide. The Catholic Church considers itself a continuation of the early Christian community established by the Disciples of Jesus. The Church's leader, the Bishop of Rome (also known as the Pope), is considered the sole successor to St Peter, who ministered in Rome in the first century AD after being appointed by Jesus as the head of the Church. The exact date when the Catholic Church became known as the Roman Catholic Church is unknown, but it is believed to have originated as an insult created by Anglicans to distinguish themselves from those in union with Rome. In 380 or 381 CE, under Emperor Theodosius, Catholicism became the official state religion of the Roman Empire, marking a significant turning point.
| Characteristics | Values |
|---|---|
| Date when Catholicism became the official religion of the Roman Empire | 380 C.E. (or 381 C.E.) |
| Emperor who made Catholicism the official religion | Theodosius I |
| Name of the decree | Edict of Thessalonica |
| Date of the Council of Constantinople | 381 C.E. |
| Date when Roman Catholicism emerged as a distinct entity | 476 C.E. |
| Date of the East-West Schism | 1054 C.E. |
| Date when the term "Roman Catholic Church" first appeared | Between 1595 and 1605 |
| Date when the term "Romanism" first appeared | Between 1665 and 1675 |
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What You'll Learn

The Council of Nicea and the Nicene Creed
The Council of Nicea was convened in 325 CE by Emperor Constantine I, who sought to unify the various Christian sects across the empire. Constantine feared that disunity among Christians would displease God and lead to trouble for the Roman Empire. The Council of Nicea is perhaps best known for its role in the development of the Nicene Creed, a statement of faith that is still used in Western Christianity today.
The Nicene Creed is a Christian statement of faith that is accepted as authoritative by the Roman Catholic, Eastern Orthodox, Anglican, and major Protestant churches. The Creed regards Jesus as divine and "begotten of the Father", and it explicitly affirms the Father as the "one God" and as the "Almighty". It also affirms Jesus Christ as the "Son of God", "begotten of the essence of the Father", and therefore "of the same substance" as the Father, or "consubstantial with the Father". This means that Jesus is considered to be "very God of very God". The Nicene Creed also mentions the Holy Spirit but does not refer to it as "God" or as "consubstantial with the Father".
The original Nicene Creed was first adopted at the First Council of Nicaea, which opened on June 19, 325 CE. The Creed was amended in 381 CE at the First Council of Constantinople, and this revised version is often referred to as the Nicene Creed or the Niceno-Constantinopolitan Creed. The Niceno-Constantinopolitan Creed is considered the only authoritative ecumenical statement of the Christian faith accepted by the Catholic Church (with the addition of the Filioque), the Eastern Orthodox Church, and other denominations.
The development of the Nicene Creed was influenced by various conflicting theological views that existed before the 4th century. These differing views spurred the ecumenical councils that eventually developed the Creed, and any beliefs that deviated from the Nicene Creed were considered heresies by its adherents. The Nicene Creed played a significant role in shaping the doctrines and beliefs of the early Christian church and contributed to the spread of Christianity throughout the early Roman Empire.
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The role of Emperor Constantine I
The Roman Catholic Church, led by the Pope and based in the Vatican, is the largest of all branches of Christianity, with about 1.4 billion followers worldwide. The Catholic Church maintains that it was established by Christ when he gave direction to the Apostle Peter as the head of the church, making him the first pope.
Constantine founded Constantinople (modern-day Istanbul) and made it the capital of the Empire. He convened councils of bishops to define the orthodoxy of the Christian faith and expand on earlier Christian councils. He played a role in elevating the status of Christianity in Rome, setting a precedent for the position of the Christian emperor within the Church. He became a great patron of the Church and raised the notions of orthodoxy, Christendom, ecumenical councils, and the state church.
Constantine's coinage and other official motifs until 325 CE were affiliated with the pagan cult of Sol Invictus. Initially, he encouraged the construction of new temples and tolerated traditional sacrifices. However, by the end of his reign, he had begun to order the pillaging and destruction of Roman temples. He also urged the Sasanian ruler Shapur II to protect Christians under his rule.
Constantine's efforts to unify the Roman Empire extended to the Christian faith. He aimed to resolve disputes and eliminate sects through military and judicial measures. He began the practice of calling ecumenical councils to determine binding interpretations of Church doctrine. His role as emperor was to enforce doctrine, root out heresy, and uphold unity within the Church.
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The role of Emperor Theodosius I
The Roman Empire officially adopted Trinitarian Christianity, or Catholicism, as its state religion in the late 4th century AD, during the reign of Emperor Theodosius I. This process, which cemented the Christianization of Rome, was the culmination of a decades-long trend toward Christianization in the Empire and marked a significant turning point in the history of Christianity.
Theodosius I, often referred to as Theodosius the Great, played a pivotal role in this process. He was the last emperor to rule over both the eastern and western halves of the Roman Empire and is known for his efforts to consolidate and codify Roman law and promote Nicene Christianity as the state religion.
Born in Hispania (modern-day Spain) in 347 AD, Theodosius rose through the ranks of the military and was proclaimed emperor in 379 AD. He inherited an empire that was still largely pagan, with a significant Christian minority. Theodosius himself was a devout Christian, and one of his earliest acts as emperor was to issue the Thessalonian Decrees in 380 AD. These decrees, addressed to the people of Constantinople, declared that only those who adhered to the Nicene Creed, which outlined beliefs in the Trinity and the divinity of Christ, would be considered Catholic and orthodox. Those who held other beliefs, such as Arianism, which denied the divinity of Christ, were labeled heretics.
Theodosius backed up his decrees with enforcement measures. He actively suppressed pagan religions, prohibiting all forms of pagan sacrifice and closing down temples. While he was initially tolerant of non-Nicene Christians, his policies became more hard-lined over time, and he eventually used force to suppress alternative forms of Christianity, such as Arianism.
In 381 AD, Theodosius convened the Second Ecumenical Council in Constantinople, which reaffirmed the Nicene Creed and established a uniform Christian doctrine for the empire. This council also addressed issues of church organization and further solidified the union of Church and State. Theodosius actively participated in the council's proceedings, emphasizing his role as both a religious and secular leader.
Through his edicts and policies, Emperor Theodosius I successfully established Catholicism as the dominant religion of the Roman Empire. His actions had a lasting impact on the course of Christianity, shaping its theology and ensuring its widespread adoption throughout the empire. Theodosius' reign thus marks a critical juncture in the Christianization of Rome and the development of Catholic orthodoxy.
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The East-West schism
The roots of the East-West Schism can be traced back to the early Christian church, when there were three prominent bishops, primarily from the politically eminent cities of Rome, Alexandria, and Antioch. The transfer of the seat of empire from Rome to Constantinople and the eclipse of Alexandria and Antioch as battlegrounds of Islam and Christianity promoted the importance of Constantinople. The Eastern Orthodox Church, which was under the patronage of the Eastern Roman Empire, evolved from the church in Constantinople.
Over time, the Roman Catholic Church in the West and the Eastern Orthodox Church in the East developed distinct characteristics and practices. The Western church was more theologically calm, while the Eastern patriarchates often experienced violent theological disputes. The Western Church was more centralized and autocratic, with the pope asserting direct jurisdiction over the entire church based on his succession from St. Peter. In contrast, the Eastern Church viewed its authority in the context of the imperial system, with the emperor, ecumenical councils, and the law as sources of unity and authority.
In the lead-up to the schism, several ecclesiastical differences and theological disputes arose between the Greek East and Latin West. These included the procession of the Holy Spirit (Filioque), the use of unleavened bread in the Eucharist, iconoclasm, the coronation of Charlemagne as Emperor of the Romans in 800, the Pope's claim to universal jurisdiction, and the place of the See of Constantinople in relation to the pentarchy. The first step towards a formal schism occurred in 1053 when Patriarch Michael I Cerularius of Constantinople ordered the closure of all Latin churches in the city. In response, the papal legate sent by Pope Leo IX travelled to Constantinople to deny Cerularius the title of "ecumenical patriarch" and excommunicate him, leading to a mutual excommunication between the two leaders.
Despite the formal schism in 1054, relations between the two churches continued, and friendly relations persisted for some time. However, events such as the Latin-led Crusades and the Massacre of the Latins in 1182 increased tensions and led to further conflict, including the Sacking of Thessalonica in 1185 and the capture and pillaging of Constantinople during the Fourth Crusade in 1204. While attempts at reconciliation have been made over the centuries, the breach has never been fully healed, and the East-West Schism continues to this day.
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The Arianism doctrine
Arianism, a heresy that arose in the fourth century, denies the divinity of Jesus Christ. Arianism is named after its major proponent, Arius (c. AD 256–336), who was an Alexandrian presbyter. Arianism holds that Jesus, as the Son of God, was created by God and is therefore distinct from and subordinate to Him. This is in contrast to the traditional doctrine of the Trinity, which asserts the unity of the Father, Son, and Holy Spirit as three distinct persons united in one Godhead. Arianism is often considered a form of Unitarian theology, emphasizing God's unity over the notion of the Trinity.
The controversy over Arianism began in the late 3rd century and persisted throughout most of the 4th century. It involved a wide range of individuals within the Church, from simple believers to bishops, emperors, and members of Rome's imperial family. Two Roman emperors, Constantius II and Valens, became Arians or semi-Arians, and the antipopes Felix II and Ursinus were also Arian. The Council of Nicea in 325 denounced Arianism as a heresy, but it remained popular throughout the Eastern and Western Roman empires. After the Council of Nicea, church leaders who had supported Arius attempted to return to their churches and banish their enemies.
Arianism was a significant doctrinal dispute within Christianity, leading to several ecumenical councils and contributing to schisms within the Church. The First Council of Constantinople in 381, convened by Emperor Theodosius I, rejected Arianism and reaffirmed the Nicene view, issuing the Nicene-Constantinopolitan Creed. Arianism was proscribed, and the Nicene Creed, affirming the divinity of Christ, was approved. However, Arianism continued to have supporters, particularly among some Germanic tribes, until the end of the 7th century.
Modern groups that embrace similar principles to Arianism include Unitarians and Jehovah's Witnesses, who are sometimes referred to as "modern-day Arians." These groups emphasize the unity and supremacy of God the Father while rejecting the full divinity of Jesus Christ. Arianism has had a lasting impact on Christian theology and continues to influence religious doctrines today.
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Frequently asked questions
In 380 C.E., under Emperor Theodosius, mainstream Christianity became the official religion of the Roman Empire.
In 381 C.E., the Council of Constantinople, convened by Emperor Theodosius I, reaffirmed the Nicene Creed and rejected the Arian view.
In 1054 C.E., a formal split occurred between the Roman Catholic and Eastern Orthodox churches, marking the beginning of the Catholic Church as we know it today. The Eastern Roman Empire continued for a thousand years after the fall of Rome, and the Byzantines became Orthodox Christians, severing ties with the Pope.











































