Carthage's convert coined Latin Christianity's trinity
Quintus Septimius Florens Tertullianus, writing from Roman Africa about 155 to 220, built the first large Latin Christian library. Later ages dubbed him father of Latin Christianity and noted his early use of trinitas. He skewered heresies, flirted with Montanist prophecy, and still shaped Cyprian and Augustine.
Reliable biography is thin and mostly self-allusion. Style shows African rhetorical fire: archaisms, vivid images, temper. He wrote at least three Greek books, now lost, called himself a Punic among Romans, and may have Berber or Punic roots; Jerome says his father served as a centurion's aide in Africa. Claims he was a jurist or priest rest on Eusebius and Jerome and on legal metaphors, yet he places himself among the laity, and identity with the jurist Tertullianus is unsure. Conversion around 197–198 reads in his pages as a sharp break: Christians, he wrote, are made rather than born. He was married to a Christian wife.
Thirty-one works survive plus fragments; some fifteen are lost, a few still extant in 814. Genres split between apology and polemic, including the Apologeticus to magistrates demanding fair trials and religious freedom and tracts against Marcion, Praxeas and Hermogenes, and disciplinary or moral essays. The five books against Marcion, dated to 207 or 208, are his most elaborate polemic. He rebutted charges of infant sacrifice and incest by citing Pliny's report of Christian oaths against crime, and coined the line that martyrs' blood is seed.
Against Praxeas he deployed trinity, economy, persons and substance, terms later central to Nicene thought, though his subordination of Son and Spirit to the Father was eventually rejected. About 207 Montanist prophecy drew him in; most scholars now deny a formal schism or excommunication, and Cyprian prized him as a teacher.
In Augustine's day Carthage still had a Tertullianist basilica before it passed to the mainstream. His earliest surviving manuscript is eighth century; most copies date from the fifteenth.
Source: Tertullian
