In 313AD, Constantine issued the Edict of Milan legalizing Christian worship.
Constantine
It was within 10 years after the 1st Pentecost in June, 31 AD that the Apostles began speading the Word of God throughout the adjacent areas - which included Greece and Rome. It really began to spread throughout Europe after Constantine of Roman accepted Christianity as a religion of the Empire.
Constantine helped spread Christianity throughout the Roman Empire. He issued the Edict of Milan in 313, which granted religious tolerance to Christians and allowed them to practice their faith openly. Constantine's conversion to Christianity and support of the religion played a significant role in its growth and development.
Jesus
Christianity
St. Paul, who spread Christianity as far as Rome. Constantine made Christianity the official state religion of the Roman Empire.
The conversion of Clovis.
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.
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.
Monks help spread Christianity across Europe.
Yes, it was. This was after Constantine's adoption of Christianity as the official religion of the Roman Empire, at which point it was spread (and stuck) to all of Europe, and a good ways into Asia and Africa.
As Roman Emporer, Constantine declared Christianity to be the official religion of the Roman Empire. At the time, the Empire was vast, so Christianity spread quickly.