The Roman Empire
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Christianity
Constantine
Jerusalem is where it began, which at the time was owned by the Roman Empire.
The Emperor Constantine, who was the ruler of the eastern empire, converted to Christianity and made it the state religion. This began the Holy Roman Empire.
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.
Christianity was illegal until the 200s and before then, Juddahism wsa popular
Christianity began when Jesus of Nazareth began his ministry in Judea (now Israel)
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.
A great many things happened over the more than 500 years of the history of this empire.
If you mean where did Christianity begin, it began in Israel.