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Millennium: 2nd millennium
1821 in various calendars
Gregorian calendar1821
Ab urbe condita2574
Armenian calendar1270
Assyrian calendar6571
Balinese saka calendar1742–1743
Bengali calendar1228
Berber calendar2771
British Regnal yearGeo. 4 – 2 Geo. 4
Buddhist calendar2365
Burmese calendar1183
Byzantine calendar7329–7330
Chinese calendar庚辰年 (Metal Dragon)
4517 or 4457
    — to —
辛巳年 (Metal Snake)
4518 or 4458
Coptic calendar1537–1538
Discordian calendar2987
Ethiopian calendar1813–1814
Hebrew calendar5581–5582
Hindu calendars
 - Vikram Samvat1877–1878
 - Shaka Samvat1742–1743
 - Kali Yuga4921–4922
Holocene calendar11821
Igbo calendar821–822
Iranian calendar1199–1200
Islamic calendar1236–1237
Japanese calendarBunsei 4
Javanese calendar1748–1749
Julian calendarGregorian minus 12 days
Korean calendar4154
Minguo calendar91 before ROC
Nanakshahi calendar353
Thai solar calendar2363–2364
Tibetan calendar阳金龙年
(male Iron-Dragon)
1947 or 1566 or 794
    — to —
(female Iron-Snake)
1948 or 1567 or 795

1821 (MDCCCXXI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1821st year of the Common Era (CE) and Anno Domini (AD) designations, the 821st year of the 2nd millennium, the 21st year of the 19th century, and the 2nd year of the 1820s decade. As of the start of 1821, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.




March 25 (O.S.)/April 6 (N.S.): Start of the Greek War of Independence
June 24: Battle of Carabobo


July 19: Coronation of George IV of the United Kingdom
July 28: Proclamation of the Independence of Peru
September 15: Declaration of Independence of Central America
September 27: Entrance of the Army of the Three Guarantees to Mexico City


September 23 (O.S.)/October 5 (N.S.): Siege of Tripolitsa

Date unknown[edit]



James Longstreet


Louis Vuitton
Rudolf Virchow
Fyodor Dostoyevsky

Date unknown[edit]



Napoleon Bonaparte


John William Polidori


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