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The Edict of Thessalonica (Greek: Έδικτο της Θεσσαλονίκης), issued on 27 February AD 380 by Theodosius I, made Nicene Christianity[note 1] the state church of the Roman Empire.[2][3][4] It condemned other Christian creeds such as Arianism as heresies of "foolish madmen," and authorized their punishment.[5]
This edict, addressed to the inhabitants of Constantinople whom Theodosius wished to pacify in order to make the city his imperial residence, constitutes the first known secular law which includes in its preamble a clear definition of what a Christian Roman ruler considers as religious orthodoxy, opening the way of repression against dissidents qualified as "heretics". The Edict of Thessalonica was subsequently incorporated into Book XVI of the Theodosian Code and was the milestone of the official Christianization of the Roman Empire.
In the most common sense, "mainstream" refers to Nicene Christianity, or rather the traditions which continue to claim adherence to the Nicene Creed.
This Edict is the first which definitely introduces Catholic orthodoxy as the established religion of the Roman world. [...] Acknowledgment of the true doctrine of the Trinity is made the test of State recognition.
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