4th Century Historical Events (301-400) | Hisdates.Com

Constantine legalizes Christianity, the foundation of Constantinople, and the Council of Nicaea.

Notable 4th Century Milestones

309 Apr 03: -BC- Origin of Seleucid Era.
356 Feb 19: Emperor Constantius II shuts all heathen temples.
336 Oct 07: St Mark ends his reign as Catholic Pope.
390 Jul 18: -BC- Battle of Allia-Gauls inflict heavy casualties on Romans.
399 Nov 27: In this year, St Anastasius I starts his reign as Catholic Pope.

Browse 4th Century by Decade and Year

300s

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310s

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320s

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330s

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340s

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350s

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360s

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370s

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380s

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390s

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