Acts 16:21

16:21 and are advocating customs that are not lawful for us to accept or practice, since we are Romans.”

Acts 16:38

16:38 The police officers reported these words to the magistrates. They were frightened when they heard Paul and Silas were Roman citizens

Acts 22:27

22:27 So the commanding officer came and asked Paul, “Tell me, are you a Roman citizen?” He replied, “Yes.”