841
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| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 810s 820s 830s – 840s – 850s 860s 870s |
| Years: | 838 839 840 – 841 – 842 843 844 |
Events
- June 25: Battle of Fontenay – Louis the German and Charles the Bald defeat Lothar.
- Battle at Magh-Ochtar in Kildare, Ireland, at which Feidlimid mac Cremthanin is defeated by the Southern Uí Neill.