Then after three years I went up to Jerusalem to see Peter, and abode with him fifteen days.
All Commentaries on Galatians 1:18 Go To Galatians 1
Tertullian of Carthage
AD 220
Having been converted from a persecutor to a preacher, he is introduced as one of the brethren to brethren, by brethren-to them, indeed, by men who had put on faith from the apostles' hands. Afterwards, as he himself narrates, he "went up to Jerusalem for the purpose of seeing Peter"