Christianity was born in a province of the Roman Empire (Judea). It developed and spread through this Empire and became the religion of the masses in the Late Roman Empire. After an alternation periods of persecutions and periods of tolerance, Christianity became the state religion of the empire.
Catholic and orthodox Christianity became the main religions of the empire. What became Catholicism was originally called the Latin or Western Church (the church of the western part of the Roman Empire). What became the Orthodox Church was originally called the Greek or Eastern Church (the church of the eastern part of the Roman Empire). All the patriarchates of the Orthodox Church developed during the days of the Roman Empire. The bishop of Rome/Pope was already important in the Roman days.
Emperor Constantine the Great (reigned 306-337) supported Christianity and built important churches: the original Basilica of St Peter's in Rome, the St John Lateran's Basilica (the city of Rome's first Cathedral and the original residence of the Popes), the Church of the Holy Apostles in Constantinople and Church of the Holy Sepulchre, in Jerusalem.
Western (Latin) Christianity and Eastern (Greek) Christianity were made the sole legitimate religions of the empire by the Edict of Thessalonica by co emperors Gratian, Theodosius I and Valentinian II in 380. The purpose of the edict was to ban the other Christian sects, which were branded as heretic. Their persecution started soon after the issuing of the edict. The main target was Arian Christianity, which was popular around the empire.
Emperor Justinian I (reigned 257-565) sponsored and protected the Orthodox Church and created laws which became the foundation of the administrative and canonical system of the Orthodox Church.
There was only one Roman Empire. Moreover, the Roman Empire did not study Christianity. An empire cannot study. The Roman Empire was where Christianity spread from Judea (which was a part of the Roman province of Syria). Both Catholic and Orthodox Christianity developed in the Roman Empire. Originally the were called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the dominant form of Christianity in the western part of the Roman Empire and the latter was the dominant form of Christianity in the eastern part of this empire. There were also dissident Christian doctrines and sects.
The emperor Theodosius I declared Christianity to be the official religion of the Roman empire. In fact, he made Christianity mandatory for all.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
Christianity developed from a religion among a small group of Jews (who lived in Judea, which was part of the Roman Empire) into a mass religion in the Roman days. It spread around the Roman Empire. It became state religion. Catholic Christianity and Orthodox Christianity developed during the Later Roman Empire. They were originally called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the main form of Christianity in the western part of the Roman Empire and the latter was the main form of Christianity in the eastern part of the Roman Empire.
Christianity
There was only one Roman Empire. Moreover, the Roman Empire did not study Christianity. An empire cannot study. The Roman Empire was where Christianity spread from Judea (which was a part of the Roman province of Syria). Both Catholic and Orthodox Christianity developed in the Roman Empire. Originally the were called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the dominant form of Christianity in the western part of the Roman Empire and the latter was the dominant form of Christianity in the eastern part of this empire. There were also dissident Christian doctrines and sects.
Roman empire.
The emperor Theodosius I declared Christianity to be the official religion of the Roman empire. In fact, he made Christianity mandatory for all.
After the Emperor Constantine converted to Christianity, that became the official religion of the Roman Empire.
The Roman Empire made Christianity the official religion of the Empire, and 'encouraged' the peoples it conquered to convert.
They chased and killed christians, and christians fled and spread the gospel through Asia and Europe. On the other hand, they also preserved versions of the early bible books in their vaults.
the religon that originated in the roman empire is Christianity
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
Christianity developed from a religion among a small group of Jews (who lived in Judea, which was part of the Roman Empire) into a mass religion in the Roman days. It spread around the Roman Empire. It became state religion. Catholic Christianity and Orthodox Christianity developed during the Later Roman Empire. They were originally called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the main form of Christianity in the western part of the Roman Empire and the latter was the main form of Christianity in the eastern part of the Roman Empire.
Christianity
Christianity was forced upon the people of the Roman empire by the emperor Theodosius I in 380 AD.
Christianity was more than just famous throughout the Roman Empire. It spread and developed in this empire. Christianity started in the Roman Empire. Judea was part of the Roman province of Syria (that is, a province of the Roman Empire). The apostles and later Christian missionaries travelled around the empire and converted many people. The Christian churches developed in the Roman Empire. Christianity became a major religion of the empire and eventually became the state religion of the empire. Both the Catholic Church and the Orthodox Church were originally churches of the Roman Empire. The former was originally called Latin or Western Christianity and was the main version of Christianity in the western part of the empire. The latter was originally called Greek or Eastern Christianity and was the main version of Christianity in the eastern part of the empire.