Questions and Answers

When did Rome become Christian?

Explore the historical events leading to Rome's conversion to Christianity. Learn when and how Rome became a Christian city.


One of the most intriguing questions in the annals of history revolves around the transformation of Rome from a pagan society to a Christian one. When did Rome become Christian? This question is not only significant for historians but also for theologians and anyone interested in the history of Western civilization. The transition was not abrupt but rather a gradual process that took place over several centuries.


Christianity, as we know, was born in the eastern part of the Roman Empire, in the region today known as the Middle East. It was here that Jesus Christ lived and preached his teachings in the 1st century AD. After his crucifixion, his followers, known as the Apostles, began spreading his teachings throughout the Roman Empire. However, it was not until the 4th century that Christianity became the dominant religion in Rome.

The Spread of Christianity in Rome

Christianity first arrived in Rome in the mid-1st century AD. The Apostle Paul is believed to have visited Rome in the 60s AD and wrote his Epistle to the Romans during this time. However, the new religion faced significant opposition and persecution from the Roman authorities. Despite this, the faith continued to spread, primarily among the poor and the slaves, who found hope and solace in its teachings.

The Edict of Milan

The turning point came in the 4th century with Emperor Constantine the Great. In 313 AD, Constantine issued the Edict of Milan, which granted religious tolerance throughout the empire. This was a landmark moment in the history of Rome, as it officially ended the persecution of Christians and allowed them to worship freely. This edict did not make Christianity the state religion of Rome, but it significantly increased its influence and acceptance.

Constantine’s Influence

Constantine himself converted to Christianity, though the exact timing and nature of his conversion are the subject of much debate among historians. Some believe that he converted on his deathbed, while others suggest that he became a Christian earlier but continued to honor the pagan gods to maintain political stability. Regardless of when he converted, Constantine’s endorsement of Christianity played a significant role in its spread throughout the empire. He funded the construction of churches, including the Old Saint Peter’s Basilica in Rome, and called the First Council of Nicaicaea in 325 AD to address theological disputes among Christians.

Christianity as the State Religion

Christianity officially became the state religion of Rome under Emperor Theodosius I. In 380 AD, he issued the Edict of Thessalonica, which declared Christianity as the state religion and all other religions as heretical. This marked the final step in Rome’s transformation from a pagan society to a Christian one.


So, when did Rome become Christian? The process began in the 1st century with the arrival of Christianity and culminated in the 4th century with the Edicts of Milan and Thessalonica. This transformation was a complex and gradual process, influenced by a range of social, political, and religious factors. It marked a significant turning point in the history of Rome and the Western world, shaping the course of Western civilization for centuries to come.

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Spiritual Culture
The spiritual and religious cultures of countries around the world. Customs, habits, beliefs, and traditional festivals of ethnic groups.
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