There was no one particular person who spread Christianity throughout the empire. All of the disciples/apostles of Jesus went out to "teach all nations". Several apostles are patrons of distant countries and they may very well have traveled to them. For example, James is affiliated with Spain, Peter with Rome, Luke, although not an apostle but a friend of Paul, is buried in Padua, Italy according to the latest DNA. Paul himself traveled and wrote throughout the Middle East until he was taken to Rome as a prisoner.
The Roman Emperor Constantine also helped spread Christianity by declaring it the official religion of the Roman Empire.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
The roman empire itself. But disciples like Paul assisted in spreading the gospel.
The spread of Christianity had political ramifications for the Roman Empire. The empire split into two, Constantinople to the east and Rome to the west
They attracted visitors to Constantinople merchant came to trade the byzantine people liked to show off their wealth and they impressed their visitors by ceremonies, glittering jewels and some rich clothes. The visitors brought all the products home with them to show others.
I learnt this in worl religions...I can't remember which emperor, but I'm pretty sure it was after Nero...anyway this guy was going to battle with an army and he claimed that god spoke to him and told him to mark their shields with his symbol and they would win, and so they did mark their shields, and they did win, they then returned to Rome and Christianity was made legal and it spread like wildfire...oh I remember his name now Emperor Constantine...so really Christianity didn't convert anybody, an emperor allowed already converted peopel to practice without fear of death and so it spread faster
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
1018
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.
Constantine
The apostles spread the message in key areas of the empire and converted people.
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.
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.
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.
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Charlemagne helped spread Christianity throughout the Frankish Empire and the lands he conquered. He spread Christianity through both peaceful conversion efforts and military conquests.
The roman empire itself. But disciples like Paul assisted in spreading the gospel.