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- 380: Theodosius I declared in the edict Cunctos populos Christianity the state religion in the Roman Empire.
- To 380 is in Imperial China under the Jin Dynasty, the use of the ship's compass usual.
- 381: The First Council of Constantinople Opel ended the Arian dispute.
- To 385 leads the Emperor Theodosius I the one already far longer known in Asia riding saddle in Europe.