- 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
- Jul 31 The Southampton plot to assassinate English king Henry V and put Edmund Mortimer on the throne is uncovered
Defiance in the Hundred Years' War
Aug 13 King Henry V of England lands his army at the mouth of Seine River in France