| Millennium: | 1st millennium |
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 790s 800s 810s – 820s – 830s 840s 850s |
| Years: | 820 821 822 823 824 825 826 827 828 829 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 820s decade ran from January 1, 820, to December 31, 829.
Events and trends
- Egbert of Wessex rises to the position of Bretwalda.
- The Saracens conquer Crete and invade Sicily.
- The Kingdom of Navarre is established.
- 829—Ansgar established the first church in Sweden.
Significant people
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