The 820s was a decade that began on 1 January 820 and ended on 31 December 829.

Millennium: 1st millennium
Centuries: 8th century9th century10th century
Decades: 790s 800s 810s820s830s 840s 850s
Years: 820 821 822 823 824 825 826 827 828 829
Categories: BirthsDeathsArchitecture
EstablishmentsDisestablishments

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