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Leader of the early Church

Peter was considered along with James the Just and John the Apostle as the three Pillars of the Church. Legitimised by Jesus' appearance, Peter assumed leadership of the group of early followers, forming the Jerusalem ekklēsia mentioned by Paul. He was soon eclipsed in this leadership by James the Just, "the Brother of the Lord." According to Lüdemann, this was due to the discussions about the strictness of adherence to the Jewish Law, when the more conservative faction of James the Just took the overhand over the more liberal position of Peter, who soon lost influence. According to Methodist historian James D. G. Dunn, this was not a "usurpation of power", but a consequence of Peter's involvement in missionary activities. The early Church historian Eusebius (c. AD 325) records Clement of Alexandria (c. AD 190) as saying:

For they say that Peter and James (the Greater) and John after the ascension of our Saviour, as if also preferred by our Lord, strove not after honor, but chose James the Just bishop of Jerusalem.

Dunn proposes that Peter was a "bridge-man" between the opposing views of Paul and James the Just:

For Peter was probably in fact and effect the bridge-man (pontifex maximus!) who did more than any other to hold together the diversity of first-century Christianity. James the brother of Jesus and Paul, the two other most prominent leading figures in first-century Christianity, were too much identified with their respective "brands" of Christianity, at least in the eyes of Christians at the opposite ends of this particular spectrum.

Paul affirms that Peter had the special charge of being apostle to the Jews, just as he, Paul, was apostle to the Gentiles. Some argue James the Just was bishop of Jerusalem whilst Peter was bishop of Rome and that this position at times gave James privilege in some (but not all) situations.