Early Christianity developed as a series of regional churches. We can see the rough outline by Constantine's time. The main political centres of the Roman Empire also became regional centres of power for the Church.
One of those centres became the Church of the East, also called the Easst Syriac church and sometimes (mistakenly) the Nestorian church. In the first century, this grouping was certainly the strongest of all the early groupings, even though it now seems on the verge of disappearing. The remains of this form of worship (churches and religious items) have been found all the way from the Mediterranean coast to China.
If the topic interests you, you may like to seek out this recent book:
Hidden Treasures and Intercultural Encounters- Studies on East Syriac Christianity in China and Central Asia.
Edited by: Dietmar Winkler and Li Tang.
A review appears in my universities, Asian Historical Research Society and the web-link is:
www. mahrs.org/books/htie