In the Bible, Tertullus (a modification of "Tertius") was a Roman advocate, whom the Jews employed to state their case against Paul in the presence of Felix (Acts 24:1-9).

The charges he raised against the apostle were "First, that he created disturbances among the Romans throughout the empire, an offence against the Roman government (crimen majestatis). Secondly, that he was a ringleader of the sect of the Nazarenes; disturbed the Jews in the exercise of their religion, guaranteed by the state; introduced new gods, a thing prohibited by the Romans. And thirdly, that he attempted to profane the temple, a crime which the Jews were permitted to punish."