820

820 (DCCCXX) was a leap year starting on Sunday of the Julian calendar, the 820th year of the Common Era (CE) and Anno Domini (AD) designations, the 820th year of the 1st millennium, the 20th year of the 9th century, and the 1st year of the 820s decade. As of the start of 820, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	1st millennium
Centuries:	8th century – 9th century – 10th century
Decades:	790s  800s  810s  – 820s –  830s  840s  850s
Years:	817 818 819 – 820 – 821 822 823

820 in other calendars

Gregorian calendar	820 DCCCXX
Ab urbe condita	1573
Armenian calendar	269 ԹՎ ՄԿԹ
Assyrian calendar	5570
Balinese saka calendar	741–742
Bengali calendar	227
Berber calendar	1770
Buddhist calendar	1364
Burmese calendar	182
Byzantine calendar	6328–6329
Chinese calendar	己亥年 (Earth Pig) 3516 or 3456     — to — 庚子年 (Metal Rat) 3517 or 3457
Coptic calendar	536–537
Discordian calendar	1986
Ethiopian calendar	812–813
Hebrew calendar	4580–4581
Hindu calendars
- Vikram Samvat	876–877
- Shaka Samvat	741–742
- Kali Yuga	3920–3921
Holocene calendar	10820
Iranian calendar	198–199
Islamic calendar	204–205
Japanese calendar	Kōnin 11 (弘仁１１年)
Javanese calendar	716–717
Julian calendar	820 DCCCXX
Korean calendar	3153
Minguo calendar	1092 before ROC 民前1092年
Nanakshahi calendar	−648
Seleucid era	1131/1132 AG
Thai solar calendar	1362–1363
Tibetan calendar	阴土猪年 (female Earth-Pig) 946 or 565 or −207     — to — 阳金鼠年 (male Iron-Rat) 947 or 566 or −206

Deaths

• Religious philosopher Adi Shankara dies.