845
| Years: 841 842 843 844 - 845 - 846 847 848 849 | |
| Decades: 810s 820s 830s - 840s - 850s 860s 870s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- March 28 - Paris is sacked by Viking raiders, probably under Ragnar Lodbrok, who collect a huge ransom in exchange for leaving.
- Vikings also sack Hamburg and Melun.
Births
Deaths
- Michael I, Byzantine Emperor (811-814)
- al-Khwarizmi, mathematician (approximate date)
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