1821

Millennium:	2nd millennium
Centuries:	18th century 19th century 20th century
Decades:	1800s 1810s 1820s 1830s 1840s
Years:	1818 1819 1820 1821 1822 1823 1824

1821 in various calendars

Gregorian calendar	1821 MDCCCXXI
Ab urbe condita	2574
Armenian calendar	1270 ԹՎ ՌՄՀ
Assyrian calendar	6571
Balinese saka calendar	1742–1743
Bengali calendar	1228
Berber calendar	2771
British Regnal year	1 Geo. 4 – 2 Geo. 4
Buddhist calendar	2365
Burmese calendar	1183
Byzantine calendar	7329–7330
Chinese calendar	庚辰年 (Metal Dragon) 4518 or 4311     — to — 辛巳年 (Metal Snake) 4519 or 4312
Coptic calendar	1537–1538
Discordian calendar	2987
Ethiopian calendar	1813–1814
Hebrew calendar	5581–5582
Hindu calendars
- Vikram Samvat	1877–1878
- Shaka Samvat	1742–1743
- Kali Yuga	4921–4922
Holocene calendar	11821
Igbo calendar	821–822
Iranian calendar	1199–1200
Islamic calendar	1236–1237
Japanese calendar	Bunsei 4 (文政４年)
Javanese calendar	1748–1749
Julian calendar	Gregorian minus 12 days
Korean calendar	4154
Minguo calendar	91 before ROC 民前91年
Nanakshahi calendar	353
Thai solar calendar	2363–2364
Tibetan calendar	阳金龙年 (male Iron-Dragon) 1947 or 1566 or 794     — to — 阴金蛇年 (female Iron-Snake) 1948 or 1567 or 795

Year 1821 (MDCCCXXI) was a common year starting on Monday (link will display the full calendar) of the Gregorian Calendar and a common year starting on Saturday of the 12-day slower Julian calendar.

Events

January–March

• January 21 – Peter I Island in the Antarctic first sighted by Fabian Gottlieb von Bellingshausen.
• January 22 – Hats are discovered to be good at keeping people warm. Discovery credited to the Russian Aristocracy.
• January 28 – Alexander Island is first discovered by Fabian Gottlieb von Bellingshausen.
• February 9 – The George Washington University is chartered as The Columbian College of the District of Columbia by President Monroe.
• March 4 – James Monroe is sworn in for his second term as President of the United States.
• March 25 (O.S.)/April 6 (N.S.) – Greece's traditional Independence Day. Recent historical evidence suggests that the Greek War of Independence against the Ottoman Empire had started before March 25.

April–June

• April 10 – Ecumenical Patriarch Patriarch Gregory V of Constantinople is blamed by the Ottoman government for being unable to suppress Greek independence and is hung outside the main gate of the Patriarchal Cathedral immediately after the celebration of Easter.
• May 5 – Emperor Napoléon I dies in exile on Saint Helena of stomach cancer.
• June 14 – King Badi VII of Sennar surrenders his throne and realm to Ismail Pasha, general of the Ottoman Empire, ending the existence of that Sudanese kingdom.
• June 19 – The Philikí Etaireía are decisively defeated by the Ottomans at Drăgăşani (in Wallachia).
• June 24 – Battle of Carabobo: Simón Bolívar wins Venezuela's independence from Spain (see Venezuela's independence).
• June 27 – The New Hampton School is founded in the United States state of New Hampshire.

July–September

• July 10 – The United States takes possession of its newly bought territory of Florida from Spain.
• July 19 – George IV is crowned king of the United Kingdom of Great Britain and Ireland.
• July 28 – Peru declares independence from Spain (see Peru's Independence from Spain).
• August 10 – Missouri is admitted as the 24th U.S. state (see History of Missouri.
• August 19 – Navarino Massacre: Greek rebels massacre 3,000 inhabitants of the city of Navarino.
• August 21 – Jarvis Island is discovered by the crew of the Eliza Frances.
• September 4 – Chilean general José Miguel Carrera is executed by an Argentinian military tribunal in the city of Mendoza.
• September 7 – The Republic of Gran Colombia (a federation covering much of present day Venezuela, Colombia, Panama, and Ecuador) is established, with Simón Bolívar as the founding President and Francisco de Paula Santander as vice president.
• September 11 – Greek War of Independence: Greek rebels massacre all the Turkish and Jewish inhabitants of Tripoli, Greece (see Fall of Tripolitsa).
• September 15 – Guatemala, El Salvador, Honduras, Nicaragua and Costa Rica gain independence from Spain (see History of Central America).
• September 18 – Amherst College is founded in Massachusetts.
• September 27 – Mexico gains its independence from Spain (see Mexican War of Independence).

October–December

• November 16 – American Old West: The Santa Fe Trail is used by the first White American.
• November 28 – Panama declares independence from Spain (see History of Panama).
• December 1 – The Dominican Republic declares independence from Spain only to be invaded by Haiti in 1822 (see History of the Dominican Republic).
• December 19 – The Eyjafjallajökull volcano in Iceland begins to erupt.

Date unknown

• High-quality cotton is introduced in Egypt.

The oath in Agia Lavra, March 25, 1821

The coronation banquet for George IV

Births

January–June

• January 8
  • James Longstreet, American Confederate general (d. 1904)
  • W.H.L. Wallace, American Civil War general (d. 1862)
• January 16 – John C. Breckinridge, United States Vice president and Confederate Secretary of State.
• February 3 – Elizabeth Blackwell, first American female physician (d. 1910).
• February 11
  • Hermann Allmers, writer (d. 1902)
  • Auguste Edouard Mariette, French Egyptologist (d. 1881)
• February 17 – Lola Montez, Irish Spanish dancer and royal mistress (d. 1861)
• February 19 – August Schleicher, German linguist (d. 1868)
• March 1 – Joseph Hubert Reinkens, German Old Catholic bishop (d. 1896)
• March 12 – Sir John Abbott, Canadian politician (d. 1893)
• March 15 – William Milligan, Scottish theologian (d. 1892)
• April 3 – Fr. Thomas Pelham Dale English mystic (d. 1892)
• April 9 – Charles Baudelaire, French poet and writer (d. 1867)
• May 8 – William Henry Vanderbilt, American entrepreneur (d. 1885)
• May 16 – Pafnuty Chebyshev, Russian mathematician (d. 1894)
• May 17 – Sebastian Kneipp, German naturopath (d. 1897)
• June 16 – Old Tom Morris, Scottish golfer (d. 1908)
• June 26 – Bartolomé Mitre, Argentine historian and politician, president of the Country (d. 1906)

July–December

• July 1 – Anatole Jean-Baptiste Antoine de Barthélemy, French archaeologist (d. 1904)
• July 9 – George Cavendish-Bentinck, British Conservative politician (d. 1891)
• July 18 – Pauline Viardot, French mezzo-soprano and composer (d. 1910)
• July 24 – William Poole, infamous member of New York City's Bowery Boys gang (d. 1855)
• August 10 – Jay Cooke, American financier (d. 1905)
• August 21 – Louis Vuitton, French fashion designer (d. 1892)
• September 28 – Jonathan Clarkson Gibbs, African-American minister and politician (d. 1874)
• October 13 – Rudolf Virchow, German physician, pathologist, biologist, and politician (d. 1902)
• November 11 – Fyodor Dostoevsky, Russian writer (d. 1881)
• November 30 – Frederick Temple, Archbishop of Canterbury (d. 1902)
• December 12 – Gustave Flaubert, French writer (d. 1880)
• December 24 – Gabriel Garcia Moreno, former President of Ecuador (d. 1875)
• December 25 – Clara Barton, first president of American Red Cross (d. 1912)

Deaths

January–June

• January 4 – Elizabeth Ann Seton, American saint (b. 1774)
• January 5 – Carlo Porta, Milanese poet (b. 1775)
• January 19 – Alexandru Suţu, prince of Moldavia (b. 1758)
• February 23 – John Keats, British poet (b. 1795)
• March 4 – Princess Elizabeth of Clarence, daughter of William, Duke of Clarence (later King William IV) (b.1820)
• March 13 – John Hunter, second Governor of New South Wales (b. 1737)
• May 5 – Napoleon I of France (b. 1769)
• May 19 – Camille Jordan, French politician (b. 1771)
• June 7 – Tudor Vladimirescu, Wallachian rebellion-leader (b. c. 1780)
• June 17 – Martín Miguel de Güemes, Argentine military leader (b. 1785)
• June 30 – José Fernando de Abascal y Sousa, viceroy of Peru (b. 1743)

July–December

• August 24 – John Polidori, physician and writer (b. 1795) (suicide)
• September 4 – José Miguel Carrera, Chilean general and founding father (b. 1785)
• September 10 – Johann Dominicus Fiorillo, German painter and art historian
• October 8 – Juan O'Donojú, viceroy of New Spain (b. 1762)
• October 11 – John Ross Key, commissioned officer in the Continental Army, judge, lawyer and the father of Francis Scott Key (b. 1754)
• October 21 – Dorothea Ackermann, German actress (b. 1752)
• November 8 – Jean Rapp, French general (b. 1771)
• December 7 – Pomare II, king of Tahiti (b. 1782)
• December 12 – Phoebe Hessel, female soldier (b. 1713)