"Chamberlain," i.e. city steward and treasurer of Corinth (Romans 16:23). The conversion of so prominent a man marks the great success of Paul's labors there. He ministered to Paul, accompanying him on his last journey to his second imprisonment at Rome; but "abode at Corinth," going no further, as Paul notes (2 Timothy 4:20) to depict his utter desertion by man. Erastus the missionary is perhaps distinct, as a chamberlain's office would hardly admit of continued missionary journeys (Acts 19:22).