Galatians 1:19 - Matthew Poole's English Annotations on the Holy Bible

The apostles were at this time scattered, either through the persecution, or for the fulfilling of the work of their apostleship; so as probably there were at this time no more of the apostles at Jerusalem, except Peter, and James the less, the son of Alpheus, who is here called the brother of our Lord, as is generally thought, according to the Hebrew idiom, who were wont to call near kinsmen, brethren. Upon another journey which Paul made to Jerusalem, he saw others (as we shall hear in the next chapter); but that was several years after this his first journey thither.