Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
The chief captain (chiliarch) who commanded the Roman troops in Jerusalem, and sent Paul under guard to the procurator Felix at Caesarea (Acts 21:31-38, 22:24-30). His letter to his superior officer is an interesting specimen of Roman military correspondence (23:26-30). He obtained his Roman citizenship by purchase, and was therefore probably a Greek.