- Feb 22 English King Henry V lays the foundation stone for Syon Abbey for nuns of the Bridgettine Order. Became one of the wealthiest abbeys in England.
- May 4 Religious reformers John Wycliffe and Jan Hus are condemned as heretics at the Council of Constance
- May 29 Pope John XXIII [Baldassare Cossa] formally deposed as Pope at the Conference of Constance, Germany, after he had fled the town in disguise
- Jul 4 Angelo Correr renounces his claim to the Papacy as Pope Gregory XII
- Jul 6 Bohemian religious reformer Jan Hus is burned at the stake in Constance, Germany
- Aug 13 King Henry V of England land army at the mouth of Seine River
- Oct 25 Battle of Agincourt: Henry V's forces defeat larger French army and the longbow defeats the armoured knight
- Oct 25 John IV van Bourgondy becomes Duke of Brabant and Limburg