1420

Events 
 May 21 – Treaty of Troyes.  With the Burgundian faction dominant in France, King Charles VI of France acknowledges Henry V of England as his heir and as virtual ruler of most of France.
 May 25 –  Henry the Navigator is appointed governor of the Order of Christ.
 The Madeira Islands were discovered by the Portuguese João Gonçalves Zarco.
 Hussite Wars – Sigismund, Holy Roman Emperor fails at the battle of Vysehrad and is ejected from  Bohemia.
 Catherine of Valois marries Henry V of England.
 Henry V of England starts the construction Grace Dieu (ship)
 Construction begins on the Temple of Heaven in Beijing, China while the Forbidden City is completed.
 World population reaches 3.75 million.

 Births 
 November 24 – John Stafford, 1st Earl of Wiltshire, English politician (died 1473)
date unknown
Jean Fouquet, French painter (died 1481)
Nicolas Jenson, French engraver (died 1480)

 Deaths 
June 11 – John III, Burgrave of Nuremberg (born c.1369)
August 9 – Pierre d'Ailly, French theologian and cardinal (born 1351)
September 3 – Robert Stewart, 1st Duke of Albany, regent of Scotland
date unknown
Epiphanius the Wise, Russian saint
Andrew of Wyntoun, Scottish chronicler (born 1350)