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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, almost synonymous with the 41st decade (401-410) This disambiguation page lists articles associated with the same title formed as a letter-number combination.

The category is for articles and events specifically related to the decade of the 400s which begins in the year 400 and ends in the year 409.. Note that 400 is actually the last year of the 4th century; 401 is the actual first year of the 5th century.

350s; 360s; 370s; 380s; 390s; 400s; 410s; 420s; 430s; 440s; 450s; Subcategories. This category has the following 16 subcategories, out of 16 total.

People who died in the decade 400s. See also: Category:400s births.

The 5th century BC started the first day of 500 BC and ended the last day of 401 BC. The Parthenon of Athens seen from the hill of the Pnyx to the west. Location 23°43'35.69"E 37°58'17.39"N

This is a list of decades, centuries, and millennia from 10,000 BC to 10,000 AD, including links to corresponding articles with more information about them.