822
| Years: 818 819 820 821 - 822 - 823 824 825 826 | |
| Decades: 790s 800s 810s - 820s - 830s 840s 850s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- Abd-ar-rahman II becomes ruler of Umayyad Spain.
- Begin of the power struggle between Byzantine Emperor Michael II and Thomas.
- Rabanus Maurus becomes abbott of Fulda.
Deaths
- Tahir ibn Husayn, founder of the Tahirid dynasty