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What time period are you talking about concerning the early Church? Acts 15 concerns the first Church Council. I’m curious as to time periods here, as to when these jurisdictions were set up. And when Rome became the Imperial City. Thanks.

Acts 15 IS the Council of Jerusalem. Some jurisdictions like Jerusalem existed from the beginning of the faith. We know that Antioch and Rome had bishops from as early as Paul's Journeys. St. Ignatius was bishop of Antioch, directly after St. Peter. Ignatius was martyred in 67 A.D. Linus was Bishop of Rome around the same time. The earliest Christian Liturgy is the Liturgy of St. Justin Martyr, from 150 AD. Justin was martyred in 167 A.D. Here is one of his earliest writings about the Eucharist: "And this food is called among us Εὐχαριστία [the Eucharist] ... For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Saviour, having been made flesh by the Word of God, had both flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh.” Rome had always been the Imperial City of the Roman Emperors, but around 300AD, when Constantine legalized and adopted Christianity as the Official Religon, then the Church gave that status to Rome. Many Years later, the distinction was also given to Constantinople.