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This article is about the year 1400.
|Centuries:||13th century – 14th century – 15th century|
|Decades:||1370s 1380s 1390s – 1400s – 1410s 1420s 1430s|
|Years:||1397 1398 1399 – 1400 – 1401 1402 1403|
|1400 by topic|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1400 in poetry|
|Ab urbe condita||2153|
|Bahá'í calendar||−444 – −443|
|English Regnal year||1 Hen. 4 – 2 Hen. 4|
|Chinese calendar||己卯年 (Earth Rabbit)
4096 or 4036
— to —
庚辰年 (Metal Dragon)
4097 or 4037
|- Vikram Samvat||1456–1457|
|- Shaka Samvat||1322–1323|
|- Kali Yuga||4501–4502|
|Japanese calendar||Ōei 7
|Minguo calendar||512 before ROC
|Thai solar calendar||1943|
|Wikimedia Commons has media related to 1400.|
- January – Henry IV of England quells the Epiphany Rising and executes the Earls of Kent, Huntingdon and Salisbury and the Baron le Despencer for their attempt to have Richard II restored as king.
- February – Henry Percy (Hotspur) leads English incursions into Scotland.
- February 14 – The deposed Richard II of England dies by means unknown in Pontefract Castle. It is likely that King Henry IV ordered his death by starvation to prevent further uprisings.
- March 23 – Five year old Trần Thiếu Đế is forced to abdicate as ruler of Đại Việt (modern-day Vietnam) in favour of his maternal grandfather and court official Hồ Quý Ly, ending the Trần dynasty after 175 years and starting the Hồ dynasty. Hồ Quý Ly subsequently changes the country's name to Đại Ngu.
- May – Frederick I, Duke of Brunswick-Lüneburg is declared as a rival to Holy Roman Emperor Wenceslaus. However, Frederick is murdered shortly after.
- August 21 – Rupert, Count Palatine of the Rhine, is elected as Holy Roman Emperor.
- September 16 – Owain Glyndŵr is proclaimed Prince of Wales by his followers and begins attacking English strongholds in north-east Wales.
- December – Manuel II Palaiologos becomes the only Byzantine Emperor ever to visit England.
- Timur defeats both the Ottoman Empire and the Mamluk Sultanate of Egypt to capture the city of Damascus in present-day Syria. Much of the city's inhabitants are subsequently massacred by Timur's troops.
- Timur conquers the Empire of The Black Sheep Turkomans, in present-day Armenia, and the Jalayirid dynasty in present-day Iraq. Black Sheep ruler Qara Yusuf and Jalayirid Sultan Ahmad flee and take refuge with the Ottoman Sultan Bayezid I.
- In modern-day Korea, King Jeongjong of Joseon abdicates in fear of an attack by his ambitious younger brother, Taejong. Taejong succeeds to the throne.
- Prince Parameswara establishes the Malacca Sultanate in present-day western Malaysia and northern Sumatra.
- Hananchi succeeds Min as King of Hokuzan in modern-day north Okinawa, Japan.
- Wallachia (modern-day southern Romania) resists an invasion by the Ottomans.
- The Kingdom of Kongo begins.
- The Haast's eagle and Moa are both driven to extinction by Māori hunters.
- The Mississippian culture starts to decline.
- Europe is reported to have around 52 million inhabitants.
- The House of Medici becomes powerful in Florence.
- Newcastle upon Tyne is created a county corporate by Henry IV of England.
- Jean Froissart completes his Chronicles detailing the events of the 14th Century in France.
- January 13 – Infante John of Portugal, the Constable (d. 1442)
- December 25 – John Sutton, 1st Baron Dudley, Lord Lieutenant of Ireland (d. 1487)
- date unknown
- January 5
- January 13 – Thomas le Despenser, 1st Earl of Gloucester, English politician (executed)
- January 16 – John Holland, 1st Duke of Exeter, English politician (executed)
- February 14 – King Richard II of England (probably murdered) (b. 1367)
- April 28 – Baldus de Ubaldis, Italian jurist (b. 1327)
- June 5 – Frederick I, Duke of Brunswick-Lüneburg, rival Holy Roman Emperor
- October 25 – Geoffrey Chaucer, English poet (b. 1343)
- November 20 – Elizabeth of Moravia, Margravine of Meissen (b. 1355) Moravia
- December 24 – Archibald the Grim, Scottish magnate (b. 1328)
- date unknown – Narayana Pandit, Indian mathematician (b. 1340)