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{{Infobox_Contents |topic_name =Christianity in the Fourth Century |subtopics =Synopsis=[[First Ecumenical Council|Council of Nicea]] |opinion_pieces ={{short_opinions}} |

}}  In the fourth century, [[Christianity]] became tolerated and the state religion of the Roman Empire, before after a final burst of severe [[persecution]]. During the century the heresy of [[Arianism]] came to forefront and was addressed at the Council of Nicea.