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Smith's Bible Dictionary
Ter'tius. (third). Probably a Roman, was the amanuensis, [A person whose employment is to write what another dictates.], of Paul in writing the Epistle to the Romans. Romans 16:22. (A.D. 55).
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Smith, William, Dr. Entry for 'Tertius'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/t/tertius.html. 1901.