This inscription from Derbe "was found at Kerti Höyük ... in 1958 and helped to establish definitively the site of the city. This imperial dedication is dated to AD 156/157 and honors Antoninus Pius as emperor. It was made by the council and people of Claudioderbe when Cornelius Dexter was governor, Aulus Julius was the magistrate, and Aulus Julius Sestullianus was the high priest of Augustus." (Wilson, p. 164)
The inscription is very worn and is difficult to read. To the left of the center of the image, some of the letters of "ΔΕΡΒΗ" (= "Derbe" in Greek) are barely visible.
The quote is from Dr. Mark Wilson's book Biblical Turkey — A Guide to the Jewish and Christian Sites of Asia Minor, p. 164. This 398-page book is filled with Wilson's descriptions and insights on numerous biblical and extra biblical sites in Turkey.