340s

The 340s decade ran from January 1, 340, to December 31, 349.

Events

340

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341

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342

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343

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344

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345

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346

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347

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348

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349

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Significant people

• Constans, Roman Emperor
• Constantius II, Roman Emperor
• Flavius Philippus, praetorian prefect of the East, consul
• Hypatia of Alexandria