Smith's Bible Dictionary
Quar'tus. (fourth). A Christian of Corinth, Romans 16:23, said to have been one of the seventy disciples, and afterward, bishop of Berytus. (A.D. about 50).
These files are public domain.
Smith, William, Dr. Entry for 'Quartus'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/q/quartus.html. 1901.