11. Although writing to the Romans, Paul did not write in Roman or Latin, but in Greek.
Although writing to the Romans, Paul wrote in Greek, not in Roman or Latin, as the Syrian Scholiast contends: for the Greek Tongue was in daily use by all Romans, even women, as we learn from Juvenal:[1] but to foreigners abiding at Rome it was even more well-known than Roman. It is to be added that this Epistle, although inscribed and sent to the Romans, was intended for the well-being of the entire Church. As Cicero says in For Archias, Now, Greek is read in almost all nations: Latin is contained within its own, tight borders.
[1]Satire 6. Decimus Junius Juvenalis was a Roman poet, flourishing at the turn of the second century.
Dr. Dilday's Lecture: "Romans, Part 3"