It was Paul most likely.
Even before that, there were people ''from every nation under heaven'' present on the day of Pentecost when the Holy spirit weas poured out and three thousand were saved. Undoubtedly these spread the Gospel truth around the Meditterranean and beyond when they returned home.
The apostles, spread Christianity around Judea while St Paul spread Christianity to Greek City states and Rome.
The Christians and then Constantine.
Phoenicians spread the Middle Eastern civilization throughout the Mediterranean.
Sunni Islam spread throughout the eastern Mediterranean region.
The spread of Christianity was possible because of stability and unification of Mediterranean achieved by Romans.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
The Phoenicians were sea going traders, and traveled all around the Mediterranean. They were an advanced Civilization, and through their trade and contact with others they spread their knowledge and customs.
The apostle Paul spread Christianity throughout the Mediterranean regionSaint Patrick spread Christianity throughout Ireland!
Phoenicians spread the Middle Eastern civilization throughout the Mediterranean.
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.
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The Jewish settled in may parts of the world by the Mediterranean, witch spread throughout their world.
Sunni Islam spread throughout the eastern Mediterranean region.
The spread of Christianity was possible because of stability and unification of Mediterranean achieved by Romans.
1018
Alexander the great spread Greek culture throughout the Mediterranean world
Islam and Christianity.