Fourth Century'' (E.J. Brill, 1994). Athanasius, and C. R. B. Shapland. The Letters of Saint Athanasius Concerning the Holy Spirit. Translated by C. R. B. Shapland. London: Epworth Press, 1951. (available online here) Nontrinitarianism Heresy in ancient Christianity Christian denominations established in the 4th century 360s establishments 380s disestablishments Nicene Creed