Centuries: 8th century - 9th century - 10th century
Decades: 770s 780s 790s 800s 810s - 820s - 830s 840s 850s 860s 870s
Years: 819 820 821 822 823 - 824 - 825 826 827 828 829
- Iņigo Arista revolts against the Franks and establishes the kingdom of Navarre (approximate date).
- Pope Eugene II begins his pontificate
- February 11 - Pope Paschal I (817-824)
- Emperor Heizei of Japan
- Thomas, claimant to the throne of the Byzantine Empire\n