400s BC (decade)

Millennium:	1st millennium BC
Centuries:	6th century BC 5th century BC 4th century BC
Decades:	420s BC 410s BC 400s BC 390s BC 380s BC
Years:	409 BC 408 BC 407 BC 406 BC 405 BC 404 BC 403 BC 402 BC 401 BC 400 BC
Categories:	Births Deaths By country By topic