Events

• February 3 – John of Gaunt, uncle of King Richard II of England and father of Henry Bolingbroke, dies.

• *Richard II cancels the legal documents allowing the exiled Henry Bolingbroke to inherit his father's land.

• *While Richard II is away on a military campaign in Ireland, Henry Bolingbroke, with exiled former Archbishop of Canterbury Thomas Arundel as an advisor, returns to England and begins a military campaign to reclaim his confiscated land.
  

  Henry IV of England.

• After regaining his power, Henry Bolingbroke is urged to take the crown from the unpopular Richard II. Richard is taken prisoner upon his returns from Ireland and eventually forced to abdicate. Parliament then charges Richard with committing crimes against his subjects.

• August 12 – Battle of the Vorskla River: Mongol Golden Horde forces led by Khan Temur Qutlugh and emir Edigu annihilate a crusading army led by former Golden Horde Khan Tokhtamysh and Grand Duke Vytautas of Lithuania.

• September 30 – Parliament accepts Henry Bolingbroke as the new king of England.

• October 13 – Henry IV of England is crowned.

• November 1 – John VI, Duke of Brittany begins his reign.

• Thomas Arundel is restored as Archbishop of Canterbury, replacing Roger Walden.

• Faraj succeeds his father, Barquq, as Mamluk Sultan of Egypt.

• Sultan Bayezid I of the Ottoman Empire invades Mamluk-occupied Syria. A rift forms between Sultan Bayezid and Timur of the Timurid Empire, who also wanted to conquer Syria.

• Ladislas regains the throne of Naples after overthrowing King Louis II.

• King Jogaila becomes sole ruler of Poland after the death of his co-ruling wife, Queen Jadwiga.

• Abu Said Uthman III succeeds Abdullah as ruler of the Marinid dynasty in present-day Morocco.

• The Principality of Achaea (now southern Greece) resists an invasion by the Ottoman Empire.

Births

• William Canynge, English merchant (approximate date; d. 1474)

• Zara Yaqob, Emperor of Ethiopia (d. 1468)

• Rogier van der Weyden (other date is 1400)

Deaths

• January 4 – Nicolau Aymerich, Catalan theologian and inquisitor

• February 3 – John of Gaunt, 1st Duke of Lancaster (b. 1340)

• May 12 – Demetrius I Starszy, Prince of Trubczewsk (in battle) (b. 1327)

• July 13 – Peter Parler, German architect (b. 1330)

• September 22 – Thomas de Mowbray, 1st Duke of Norfolk, English politician (b. 1366)

• November 1 – John V, Duke of Brittany (b. 1339)

• July 17 – Queen Jadwiga, joint ruler of Poland

• date unknown

• *Spytek z Melsztyna, Polish nobleman

• *William le Scrope, 1st Earl of Wiltshire (b. 1350)

• *Sultan Barquq of Egypt

• *Trần Ngung, former ruler of Tran Dynasty Vietnam (forced to commit suicide)