Which teaching helped to spread Christianity in the Roman Empire? Slaves and the poor could hope for a better life after death. The Gospels written in Greek by his followers. Why did the Jews distrust King Herod?
Charlemagne helped spread Christianity throughout the Frankish Empire and the lands he conquered. He spread Christianity through both peaceful conversion efforts and military conquests.
Roman Empire
The apostles and Paul traveled throughout the region teaching others.
During the Pax Romana, he promoted Christianity even though he was a Pagan.
Emperor Constantine I and his mother Helena.
It was Charlemagne.
Kings and Monasteries helped to spread Christianity.
Paul of Tarsus, who was previously known as Saul spread Christianity as the first Christian missionary, or person who spreads their belief to non-believers. He travelled across the Roman Empire, sending Christian messages to gentiles and non-Jewish communities as well as to Jews. This allowed more people to follow the faith. He preached about Christianity in new areas where no one had preached before, and established Christianity there.
The Roman Empire was the geographical factor which first helped the spread of Christianity. It started in Judea, which was part of the Roman Empire. It was spread through this empire, especially its eastern part by Christian preachers. Originally the Christians were Jews who preached other Jews and followed Jewish law. Paul created a theology which opened Christianity to the gentiles (non-Jews) of the Roman Empire. He said that faith in Jesus and following his teaching was what was required for salvation. Therefore, you did not have to be a Jew or follow Jewish law to be a Christian. Christianity was endorsed by all but one of the emperors after Constantine the Great. This helped his spread. The co-emperors Gratian and Theodosius made mainstream Christianity (the Latin/Western Church and the Greek/eastern Church, which later came to be called Catholic and Orthodox respectively) the sole legitimate religion of the empire.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
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
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.