The Edict of Thessalonica, issued on 27 February AD 380 by Theodosius I, made Nicene Christianity the state church of the Roman Empire. It condemned other Christian creeds such as Arianism as heresies of "foolish madmen", and authorized their punishment.

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Country: Ancient Rome

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Edict of Thessalonica

380 CE edict establishing Christianity as the Roman Empire's state religion

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