400s

Decades of the 400s
400s 410s 420s 430s 440s 450s 460s 470s 480s 490s
300s 400s 500s

400s may refer to:

The period from 400 to 499, almost synonymous with the 5th century (401–500)
The period from 400 to 409, known as the 400s decade

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