List of 1440 Major News Events in History, Most Important Historical Events in 1440
| Date | Event |
|---|---|
| February 21, 1440 | The Prussian Confederation is formed. |
| September 15, 1440 | Gilles de Rais, one of the earliest known serial killers, is taken into custody upon an accusation brought against him by Jean de Malestroit, Bishop of Nantes. |