AD 381: Heretics, Pagans and the Christian State by Charles Freeman

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In AD 381, Theodosius, emperor of the eastern Roman empire, issued a decree in which all his subjects were required to subscribe to a belief in the Trinity of the Father, Son and Holy Spirit. This edict defined Christian orthodoxy and brought to an end a lively and wide-ranging debate about the nature of the Godhead; all other interpretations were now declared heretical.

Pimlico, 2009.
ISBN: 9781845950071. 272 pp.
Softcover. Very good.