• Timur (Tamerlane) continues his conquests, ravaging Georgia and capturing the cities of Aleppo and Baghdad.
• English King Henry IV launches an ineffective invasion of Scotland, and is forced to retreat.
• The German princes depose King Wenceslaus and replace him with King Rupert.
• Welsh lord Owain Glyndwr proclaims himself Price of Wales and launches a revolt against English rule that will last until 1409.
• A Castilian fleet sent by King Henry III of Castile and Leon destroys the north African city of Tétouan which had been a haven for pirates.

These people were born in 1400:

• Flemish painter Rogier Van Der Weyden.

These people died in 1400:

• English poet Geoffrey Chaucer.
• Deposed English king Richard II, in prison, possibly murdered.
• William Langland, the putative author of Piers Plowman (approximate).
• Alice Perrers, the mistress of English king Edward III, who had wielded great influence over the court in the 1370s.

1399 | 1401