The Church in Jerusalem

In case you were curious, here is a bit of church history regarding the earliest Christian community in Jerusalem:

The church began in Jerusalem on the day of Pentecost (Acts 2). The earliest Christians were Jewish and they continued to worship in the Temple; however, they also began to gather on the first day of the week (Sunday) to break bread and celebrate the resurrection of Jesus. The apostles Peter and John as well as James the brother of Jesus seem to have been the original pillars or leaders of the Jerusalem church (Galatians 2:9; Acts 15). Peter left Jerusalem after he was miraculously freed from imprisonment by Herod Agrripa I (ca. A.D. 43; James the brother of John was beheaded by Herod just prior to Peter's arrest). James the brother of Jesus was executed in A.D. 62 by the order of Ananus the high priest. Shortly after that, and in order to avoid the Jewish rebellion that broke out in A.D. 66 (the Jewish War ended in the fall of Jerusalem and the destruction of the Temple in A.D. 70), the leaders of the church decided to move to Pella in Perea, which was a city on the other side of the Jordan River. At this same time it is likely that John also departed Jerusalem to guide the church in Ephesus. As a result, the ancient Jewish church was increasingly isolated and the main leadership of the church at large had shifted to Gentile Christians.

Source

Gonzalez, Justo L. The Story of Christianity, Volume One: The Early Church to the Dawn of the Reformation (Revised and Updated). New York: HarperOne, 2010.