Judeo-Christian ideas spread throughout the Roman Empire primarily through the missionary efforts of early Christians, such as the Apostle Paul, who traveled extensively to spread their teachings. The use of Greek as a common language facilitated communication and the dissemination of texts like the New Testament. Additionally, the social networks of early Christians, including trade routes and urban centers, helped to share these ideas across diverse populations. Over time, as Christianity gained acceptance and eventually state support, these teachings became more integrated into the cultural fabric of the empire.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
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The roman empire itself. But disciples like Paul assisted in spreading the gospel.
The Romans who remained pagans did not contribute to the spread of Christianity Neither did Julian, who was the only pagan emperor in the Later Roman Empire
The apostles and Paul traveled throughout the region teaching others.
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There was not one person who spread Christianity throughout the Roman empire. Christianity began its expansion by the efforts of the original apostles and Paul. These men gained followers who in turn gained followers and the movement snowballed.
Famine and disease spread throughout the empire
By 325ad Christianity had spread throughout the Roman Empire and to Britain. If you google "spread of Christianity map" you will find maps showing the spread.
There was no single person who spread Christianity throughout the empire. Each one of the apostles of Jesus went to different areas to preach. Paul also did a lot of writing and traveling and converting.
Because it was the Roman Empire.
More than anyone before him, Emperor Constantine spread Christianity throughout the Roman Empire. True, Christianity was already well established, especially in the Greek-speaking east, long before the fourth century, but Constantine gave the religion state patronage, offered career preferment to those who claimed to be Christians, and began the long persecution of the pagan temples. From this time, and with this impetus, Christianity spread quickly in the Roman Empire.