1241
- April 9 - Mongols of Golden Horde under the command of Subotai defeat feudal Polish nobility, including Knights Templar, in the battle of Liegnitz.
- April 11 - Batu Khan defeats Béla IV of Hungary at the Battle of Mohi.
- April 27 - Mongols defeat Bela IV of Hungary in the battle of Sajo.
- Snorri Sturluson, Icelandic saga writer, is murdered by Gissur Ŝorvaldsson, an emissary of the King of Norway.