Tertullian - AbsoluteAstronomy.com

Quintus Septimius Florens Tertullianus, anglicised as Tertullian (c. 160 – c. 220 AD), was a prolific early Christian author from Carthage

Carthage

Carthage , implying it was a 'new Tyre') is a major urban centre that has existed for nearly 3,000 years on the Gulf of Tunis, developing from a Phoenician colony of the 1st millennium BC...

in the Roman province of Africa. He is the first Christian author to produce an extensive corpus of Latin

Latin

Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

Christian literature. He also was a notable early Christian apologist

Christian apologetics

Christian apologetics is a field of Christian theology that aims to present a rational basis for the Christian faith, defend the faith against objections, and expose the perceived flaws of other world views...

and a polemicist against heresy

Heresy

Heresy is a controversial or novel change to a system of beliefs, especially a religion, that conflicts with established dogma. It is distinct from apostasy, which is the formal denunciation of one's religion, principles or cause, and blasphemy, which is irreverence toward religion...

. Tertullian has been called "the father of Latin Christianity" and "the founder of Western theology."
Though conservative, he did originate and advance new theology to the early Church.