821

This article is about the year 821.

Millennium:	1st millennium
Centuries:	8th century – 9th century – 10th century
Decades:	790s  800s  810s  – 820s –  830s  840s  850s
Years:	818 819 820 – 821 – 822 823 824

821 by topic

Politics

State leaders – Sovereign states

Birth and death categories

Births – Deaths

Establishment and disestablishment categories

Establishments – Disestablishments

821 in other calendars

Gregorian calendar	821 DCCCXXI
Ab urbe condita	1574
Armenian calendar	270 ԹՎ ՄՀ
Assyrian calendar	5571
Bahá'í calendar	-1023–-1022
Bengali calendar	228
Berber calendar	1771
English Regnal year	N/A
Buddhist calendar	1365
Burmese calendar	183
Byzantine calendar	6329–6330
Chinese calendar	庚子年十一月廿四日 (3457/3517-11-24) — to — 辛丑年十二月初四日 (3458/3518-12-4)
Coptic calendar	537–538
Ethiopian calendar	813–814
Hebrew calendar	4581–4582
Hindu calendars
- Vikram Samvat	877–878
- Shaka Samvat	743–744
- Kali Yuga	3922–3923
Holocene calendar	10821
Iranian calendar	199–200
Islamic calendar	205–206
Japanese calendar
Korean calendar	3154
Minguo calendar	1091 before ROC 民前1091年
Thai solar calendar	1364

Year 821 (DCCCXXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

By place

Asia

• Tang Mu Zong becomes emperor of China.
• First recorded session of the Parliament of Croatia

Byzantine Empire

• The Byzantine general Thomas the Slav secures control over most of Byzantine Anatolia as well as recognition from the Abbasid Caliphate, and crosses over into Europe. The emperor Michael II is blockaded in Constantinople, but Thomas' first attack on the city fails.

Deaths

• February 11 – Benedict of Aniane, monastic founder and saint
• December 18 – Theodulf, Bishop of Orléans
• Coenwulf, king of Mercia