The 840s decade ran from January 1, 840, to December 31, 849.

Significant people

• Al-Mu'tasim

• Al-Wathiq

• Alfred the Great

• Louis the Pious

• Charles the Bald

• Ermentrude of Orléans

• Louis the Stammerer

• Louis the German

• Lothair I

• Kenneth I of Scotland

• Ragnar Lodbrok

• Michael III

References

Citation

Bibliography