Years: 397 398 399 400 - 401 - 402 403 404 405

Decades: 370s 380s 390s - 400s - 410s 420s 430s

Centuries: 4th century - 5th century - 6th century

Events:

• Pope Innocent I succeeds Pope Anastasius I.
• The Vandals start their westward trek from Dacia and Hungary (or 400).
• The Visigoths begin to attack the northernmost reaches of Italy, causing destruction in the countryside.
• Kumarajiva arrives in Changan.

Births:

• Theodosius II, East Roman Emperor.
• Aelia Eudocia, wife of Theodosius II

Deaths:

• December 19 - Pope Anastasius I

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For Greece's 401 GSNA general military hospital of Athens, see Military of Greece.

For Ontario's Highway 401, see Macdonald-Cartier Freeway.