Romans 16:22

‘I Tertius, who write the letter, salute you in the Lord.'

Tertius was here seen as acting as Paul's amanuensis, and adds his own greeting to the letter. It is probable, in view of the Pauline style of the letter, that in this case his duties were restricted to writing word by word in accord with Paul's dictation, although often an amanuensis could have a much greater impact on the style of a letter.