'Visit to Derbe, and return journey to Antioch of Syria. Derbe, or Claudio-Derbe, where the work of the apostles seems to have been very successful, was a small Lycaonian town on the extreme boundary of the Roman province of Galatia. A convert of this city named Gaius is mentioned (Acts 20:4).
Acts 14:21-28
21 And when they had preached the gospel to that city, and had taught many,a they returned again to Lystra, and to Iconium, and Antioch,
22 Confirming the souls of the disciples, and exhorting them to continue in the faith, and that we must through much tribulation enter into the kingdom of God.
23 And when they had ordained them elders in every church, and had prayed with fasting, they commended them to the Lord, on whom they believed.
24 And after they had passed throughout Pisidia, they came to Pamphylia.
25 And when they had preached the word in Perga, they went down into Attalia:
26 And thence sailed to Antioch, from whence they had been recommended to the grace of God for the work which they fulfilled.
27 And when they were come, and had gathered the church together, they rehearsed all that God had done with them, and how he had opened the door of faith unto the Gentiles.
28 And there they abode long time with the disciples.