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February 27, 280: Constantine, the first Roman emperor converted to Christianity, is born. Though some scholars question the authenticity of Constantine's conversion (which came after he saw a vision on the battlefield), the emperor did seek to settle church controversies by calling the Council of Nicea in 325 (see issue 57: Converting the Empire).

February 27, 380: Roman emperor Theodosius makes Christianity the official law of the land. "It is our will," he decreed, "that all the peoples we rule ...

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