Tertulian was not a Prophet, the Bishop of Rome who lived at the same time, rejected his doctrine as heresy.
I believe the Bishop of Rome at that time was a better authority on Bible doctrine than Tertulian.
Nevertheless, Tertulian's doctrine was adopted some 150 years later. There were also no Prophets who were part of that process.
Where did you think the doctrine came from?
It sure didn't come from some guy with his FACE in a hat!!