I, Tertius, who wrote down this letter, greet you in the Lord.
As the Apostle had before sent his own salutations to many of this church, and that of the churches round him to them all, he here adds an affectionate remembrance of them from some particular persons who were now with him, the better to promote acquaintance and fellowship among distant saints, and that the subscribing of these worthy names, known to them, might the more recommend this epistle.
Commenting on Romans 16:21-24
Gaius mine host,.... There was one Gaius a Macedonian, that was with the apostle at Ephesus, Act 19:29; and another Gaius of Derbe, that accompanied him into Asia, Act 20:4; whether either of these, as the latter seems more probable, was this person, is not certain.
Verse 23. I Tertius. Of Tertius nothing more is known than is mentioned here. Who wrote this. It is evident that Paul employed an amanuensis to write this epistle, and perhaps he commonly did it. Tertius, who thus wrote it, joins with the apostle in affectionate salutations to the brethren at Rome. To the epistle Paul signed his own name, and added a salutation in his own hand-writing.