Millennium: | 1st millennium |
Centuries: | 4th century – 5th century – 6th century |
Decades: | 370s 380s 390s – 400s – 410s 420s 430s |
Years: | 400 401 402 403 404 405 406 407 408 409 |
Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 400s was a decade that started on 1 January 400 and ended on 31 December 409.