'We authorise followers of this law to assume the title of orthodox Christians; but as for the others since, in our judgement, they are foolish madmen, we decree that they shall be branded with the ignominious names of heretics.' - Emperor Theodosius.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. Moreover, for the first time in a thousand years of Greco-Roman civilization free thought was unambiguously suppressed. Not since the attempt of the pharaoh Akhenaten to impose his god Aten on his Egyptian subjects in the fourteenth century BC had there been such a widesweeping programme of religious coercion.Yet surprisingly this political revolution, intended to bring inner cohesion to an empire under threat from the outside, has been airbrushed from the historical record..