|Centuries:||3rd century – 4th century – 5th century|
|Decades:||370s 380s 390s – 400s – 410s 420s 430s|
|Years:||397 398 399 – 400 – 401 402 403|
- First invasion of Italy by Alaric (probable date).
- The Vandals start their westward trek from Dacia and Hungary (approximate date).
- Construction (and therefore occupation) at Great Zimbabwe begins (approximate date).
- Earliest date of human occupation on Easter Island (approximate date).
- Chrysanthemums are introduced to Japan (approximate date).