List of 1240 Major News Events in History, Most Important Historical Events in 1240
| Date | Event |
|---|---|
| June 12, 1240 | At the instigation of Louis IX of France, an inter-faith debate, known as the Disputation of Paris, starts between a Christian monk and four rabbis. |
| July 15, 1240 | Swedish–Novgorodian Wars: A Novgorodian army led by Alexander Nevsky defeats the Swedes in the Battle of the Neva. |
| December 6, 1240 | Mongol invasion of Rus': Kyiv, defended by Voivode Dmytro, falls to the Mongols under Batu Khan. |