844
| Years: 840 841 842 843 - 844 - 845 846 847 848 | |
| Decades: 810s 820s 830s - 840s - 850s 860s 870s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- Succession of Pope Sergius II (844 - 847).
- Rhodri the Great becomes king of Gwynedd.
- June 15: Louis II is crowned emperor.
- Dorestad is raided by Vikings.
Deaths
- January 25: Pope Gregory IV (827 - 844)
- Merfyn Frych, king of Gwynedd