As an official religion, it started in Rome.
In the region of palestine.
The Middle East, specifically the Levant region.
Palestine.
Palestine is a region that includes parts of several countries in southwest Asia.
Iraq
Palestine
Currently its the area known as Israel.
In the region of Israel, which was called Palestine at that time.
The area where Jesus lived was Palestine.
Jerusalem is located within the Judean Highlands region of Israel/Palestine, which is part of the Levant region, within the wider Middle East.
I would love to visit Palestine; however, I would be reluctant to do so because of the political unrest in the region.