I Tertius, who wrote this epistle, greet you in the Lord.
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Ambrosiaster
AD 400
Tertius was his name, not a number [third]. He was the scribe who wrote the epistle, and Paul allowed him to send his own greetings to the Romans. Commentary on Paul’s Epistles.
This Tertius was the amanuensis, or secretary of St. Paul, and wrote this epistle as St. Paul dictated. It is not on that account less divinely inspired than the rest. (Estius)