Jamieson, Fausset and Brown on Acts 15:22-23

22-23. Judas surnamed Barsabas--therefore not the apostle "Judas the brother of James" (Ac 1:13), surnamed "Thaddeus" (Mt 10:3); nor can it be shown that he was a brother of "Joseph called Barsabas" (Ac 1:23). But nothing is known of him beyond what is here said.

and Silas--the same as "Silvanus" in the Epistles. He became Paul's companion on his second missionary journey (Ac 15:40).

chief men among the brethren--selected purposely as such, to express the honor in which they held the church at Antioch, and the deputies they had sent to the council, and, as the matter affected all Gentile converts, to give weight to the written decision of this important assembly. They were "prophets," Ac 15:32 (and see on Ac 11:27), and as such doubtless their eminence in the church at Jerusalem had been obtained.