Year '1821' ('
MDCCCXXI') was a
common year starting on Monday (link will display the full calendar) of the
Gregorian Calendar (or a
common year starting on Saturday of the 12-day slower
Julian calendar).
Events of 209090
January - March
★
March 4 -
James Monroe sworn in as
President of the United States, for second term.
★
25 March (
Julian calendar)/
April 6 (
Gregorian calendar) -
Greece declares its liberation from the
Ottoman Empire, beginning the
Greek War of Independence.
April - June
★
May 5 -
Napoléon dies in exile at
Saint Helena. The cause of his death is still disputed.
★
June 19 - Decisive defeat of the
Philikí Etaireía by the
Ottomans at
Drăgăşani (in
Wallachia).
★
June 24 -
Simón Bolívar wins the
Battle of Carabobo, ensuring
Venezuela's independence from
Spain. (See .)
July - September
★
July 10 - The
United States takes possession of its newly-bought territory of
Florida from
Spain.

The coronation banquet for George IV
★
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 21 -
Jarvis Island is discovered by the crew of the Eliza Frances.
★
September 7 - The
Republic of Gran Colombia (a
federation covering much of presentday
Venezuela,
Colombia,
Panama, and
Ecuador) was established, with
Simón Bolívar as the founding
President and
Francisco de Paula Santander as
vice president.
★
September 11 -
Greek War of Independence -
Tripoli, Greece Greeks rebels massacre all turkish and jewish inhabitants of the city. (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.
★
September 27 -
Mexico gains its independence from
Spain. (See
Mexican War of Independence.)
October - December
★
November 9 - the first
American pharmacy college holds classes in
Philadelphia.
★
November 16 -
American Old West:
Santa Fe Trail used by first
White American.
★
November 28 -
Panama declares independence from
Spain. (See
History of Panama).
Births
January - June
★
January 8
★
★
James Longstreet, American Confederate general (d.
1904)
★
★
W.H.L. Wallace, American Civil War general (d.
1862)
★
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 15 -
William Milligan, Scottish theologian (d.
1892)
★
April 3 -
Fr. Thomas Pelham Dale English mystic (d.
1892)
★
April 9 -
Charles-Pierre 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)
July - December
★
July 1 -
Anatole Jean-Baptiste Antoine de Barthélemy, French archaeologist (d.
1904)
★
July 18 -
Pauline Garcia-Viardot, French mezzo-soprano and composer (d.
1910)
★
August 10 -
Jay Cooke, American financier (d.
1905)
★
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 25 -
Clara Barton, First president of American Red Cross (d.
1912)
★
Sir John Joseph Caldwell Abbott, Canadian politician (d.
1893)
: ''See also .''
Deaths
January - June
★
January 4 -
Elizabeth Ann Seton, American saint (b.
1774)
★
January 19 -
Alexandru Suţu, prince of Moldavia (b.
1758)
★
February 23 -
John Keats, British poet (b.
1795)
★
March 4 -
Princess Elizabeth of Clarence (b.
1820), daughter of
William, Duke of Clarence (later King William IV).
★
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. cca.
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
★
September 10 -
Johann Dominicus Fiorillo, German painter and art historian
★
September 15 -
Maria Branwell Brontë, mother to famous British authors Charlotte and Emily Brontë
★
September 28 -
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)
★
November 8 -
Jean Rapp, French general (b.
1771)
★
December 7 -
Pomare II, king of Tahiti
★
December 12 -
Phoebe Hessel, female soldier (b.
1713)
: ''See also .''