Tertullian
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Tertullian originated new theological concepts and advanced the development of early Church doctrine. He is perhaps most famous for being the first writer in Latin known to use the term ''trinity'' (Latin: ''trinitas''). However, some of his teachings, such as the subordination of the Son and Spirit to the Father, were later rejected by the Church. According to Jerome he later joined the Montanist sect and may have apostasized; however, modern scholars dispute this. Provided by Wikipedia
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