Quintus Septimius Florens Tertullianus, anglicized as Tertullian, (ca. 155–230) was a church leader and prolific author of Early Christianity. He was born, lived, and died in Carthage, in what is today Tunisia.
Tertullian denounced Christian doctrines he considered heretical, but later in life adopted views that came to be regarded as heretical themselves. He was the first great writer of Latin Christianity, thus sometimes known as the "father of the Latin Church". He introduced the term Trinity, as the Latin trinitas, to the Christian vocabularyA History of Christian Thought, Paul Tillich, Touchstone Books, 1972. ISBN 0-671-21426-8 (p. 43) and also probably of the formula "three Persons, one Substance" as the Latin "tres Personae, una Substantia" (itself from the Koine Greek "treis Hypostases, Homoousios") and also the terms vetus testamentum ("old testament") and novum testamentum ("new testament"). In his Apologeticus, he was the first Latin author to qualify Christianism as the 'vera religio', and symmetrically relegating the classical Empire religion and other accepted cults as mere 'superstitions'. Tertullian left the Church of Rome late in his life and joined the heretical Montanists, thus explaining his failure to attain sainthood.

Catholic Encyclopedia: Tertullian - Long article on this ecclesiastical writer.
Meta Description: [ Ecclesiastical writer in the second and third centuries ]
Early Church.org.uk: Tertullian of Carthage - Overview of Tertullian's contributions, methods of exegesis, rhetoric, anti-intellectualism, and Montanism. Includes sources.
Meta Description: [ Early Church.org.uk: An Internet Resource for Studying the First Centuries of Christianity ]
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Tertullian On Fasting - Survey on individual, communal, and stational fasts in Tertullian's Carthaginian community.
Tertullianus, Quintus Septimius Florens - Extensive entry on Tertullian encompasses his life and theological notions, and includes outlines of his tracts. From the Early Christian Writings.
Meta Description: [ Tertullian (Roberts-Donaldson). On Early Christian Writings. ]
The Development of the Canon of the New Testament: Tertullian of Carthage - Tertullian's citations of New Testament writings and other related works.
Meta Description: [ The Development of the Canon of the New Testament ]
The Ecole Glossary: Tertullian - Brief biography, by Elise M. Bender.
The Tertullian Project - Information about this second-century church father, his works, lost works, manuscripts.
Meta Description: [ Tertullian latin texts, translations, editions, bibliography, links, manuscripts, text criticism, early christians, fathers ]
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