This verse references this verse. Act 20:17 And from Miletus he sent to Ephesus, and called the elders of the church.
Your bible says 'ancients' as opposed to elders...It is NOT a reference to 'Apostles'...And these elders that were shepherds that were appointed by the Holy Spirit were appointed in ALL the churches...
They were under the authority of Paul, NOT Peter...The apostles did not cross over into another's jurisdiction...And Paul was not under the authority of Peter...Paul was the apostle for the gentile church...
St. Peter was the first to baptize a Gentile, not St. Paul. And bear in mind this also:
"And when there had been much disputing, Peter, rising up, said to them: Men, brethren, you know, that in former days God MADE CHOICE among us, that by my mouth the Gentiles should hear the word of the gospel, and believe.
Seems that God did make choice among them and He chose St. Peter originally.