The Apostle Paul
Galatians 2:9BSB·traditional attribution

And recognizing the grace that I had been given, James, Cephas, and John—those reputed to be pillars—gave me and Barnabas the right hand of fellowship, so that we should go to the Gentiles, and they to the circumcised.

Geneva Bible Notes Reformed

And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we [should go] unto the heathen, and they unto the circumcision. (g) Whom alone and only these men count for pillars of the Church, and whose name they abuse to deceive you.

Jamieson-Fausset-Brown Reformed

James--placed first in the oldest manuscripts, even before Peter, as being bishop of Jerusalem, and so presiding at the council (Acts 15:1-29). He was called "the Just," from his strict adherence to the law, and so was especially popular among the Jewish party though he did not fall into their extremes; whereas Peter was somewhat estranged from them through his intercourse with the Gentile Christians.

John Gill Reformed Baptist

And when James, Cephas, and John,.... These are the persons all along designed, though not till now named. James was the brother of our Lord, the son of Alphaeus, who wrote the epistle that goes by his name, made that famous speech in the synod at Jerusalem, Act 15:13, presided in that church, was a man of great holiness, and much esteemed of by the...