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 1821
January - June
The oath in Agia Lavra, March 25, 1821
July - December
The coronation banquet for George IV
Undated
Ongoing
Births
January - June
- January 8
- 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
- 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)
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)
- July 24 - William Poole, Infamous member of New York City's Bowery Boys gang (d. 1855)
- 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)
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 (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
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