He returned to politics to oppose the pro-slavery Kansas – Nebraska Act ( 1854 ); this law repealed the slavery-restricting Missouri Compromise ( 1820 ).

Percy Bysshe Shelley composed a " Hymn of Apollo " ( 1820 ), and the god's instruction of the Muses formed the subject of Igor Stravinsky's Apollon musagète ( 1927 – 1928 ).

Causes include controversy over admitting Missouri as a slave state in 1820, the acquisition of Texas as a slave state in 1845 and the status of slavery in western territories won as a result of the Mexican – American War and the resulting Compromise of 1850.

* 1820 – Nadar, French photographer, caricaturist, journalist, novelist and balloonist ( d. 1910 )

* 1820 – Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.

* 1820 – George Grove, English historian ( d. 1900 )

* 1820 – John Tyndall, British physicist ( d. 1893 )

* 1890 – David Wilber, American politician ( b. 1820 )

* 1751 – Wilhelmina of Prussia, Princess of Orange ( d. 1820 )

* 1820 – Andrew Rainsford Wetmore, Canadian politician ( d. 1892 )

* 1820 – Constitutionalist insurrection at Oporto, Portugal.

* Alfonso Sanz y Martínez de Arizala ( 28 January 1880, Madrid – 1970 ), married in 1922 to María de Guadalupe de Limantour y Mariscal ( d. 1977, Marbella ), daughter of Julio de Limantour y Marquet ( 17 June 1863, Mexico City – 11 October 1909, Mexico City ) and wife Elena Mariscal y ..., paternal granddaughter of French Joseph Yves de Limantour y Rence de la Pagame ( 1812, Ploemeur – 1885, Mexico City ) and wife Adèle Marquet y Cabannes ( 1820, Bordeaux –?

* 1771 – Karl Philipp Fürst zu Schwarzenberg, Austrian field marshal ( d. 1820 )

* 1820 – Alexander Cartwright, American inventor of Baseball ( d. 1892 )

Anne Brontë (; 17 January 1820 – 28 May 1849 ) was a British novelist and poet, the youngest member of the Brontë literary family.

Four more children followed: Charlotte, ( 1816 – 1855 ), Patrick Branwell ( 1817 – 1848 ), Emily, ( 1818 – 1848 ) and Anne ( 1820 – 1849 ).

* 1899 – Joseph Wolf, German artist ( b. 1820 )

* Daniel Boone ( November 2, 1734 October 22 – September 26, 1820 ) was an American pioneer, explorer, and frontiersman whose frontier exploits made him one of the first folk heroes of the United States.

* 1820 – The Venus de Milo is discovered on the Aegean island of Melos.

A significant contribution to the chemistry of alkaloids in the early years of its development was made by the French researchers Pierre Joseph Pelletier and Joseph Bienaimé Caventou, who discovered quinine ( 1820 ) and strychnine ( 1818 ).

Portrait of Beethoven by Joseph Karl Stieler, 1820

Group litigation survived in the United States only thanks to the influence of Supreme Court Associate Justice Joseph Story, who imported it in a rather mangled form into U. S. law through summary discussions in his two equity treatises as well as his famous opinion in West v. Randall ( 1820 ).

They sent pianos to both Joseph Haydn and Ludwig van Beethoven, and were the first firm to build pianos with a range of more than five octaves: five octaves and a fifth during the 1790s, six octaves by 1810 ( Beethoven used the extra notes in his later works ), and seven octaves by 1820.

Quinine was isolated and named in 1820 by French researchers Pierre Joseph Pelletier and Joseph Bienaimé Caventou.

* February 13 – Sir Joseph Banks, British naturalist and botanist ( d. 1820 )

* 1820: Joseph Smith, Jr. receives his First Vision in the spring in Palmyra, New York.

* May 21 – Joseph Fouché, French statesman ( d. 1820 )

Sir Joseph Banks, 1st Baronet, GCB, PRS ( 19 June 1820 ) was an English naturalist, botanist and patron of the natural sciences.

* Pierre Joseph Pycke ( 1817 – 1820 )

* Leonard Pierre Joseph du Bus de Gisignies ( 1820 – 1823 )

It was named " Banks Land " in 1820 by Sir William Edward Parry in honour of Sir Joseph Banks.

According to The Church of Jesus Christ of Latter-day Saints ( LDS Church ), the Great Apostasy started not long after Jesus ' ascension and continued until Joseph Smith's First Vision in 1820.

The Church of Jesus Christ of Latter-day Saints maintains that its first prophet, Joseph Smith, was visited by God and Jesus Christ in 1820.

Naturalist Sir Joseph Banks ( 1743 – 1820 ) was laid to rest at St Leonard's Church.

The county was formed in 1820 by the first magisterial court consisting of members Edward Shanklin, John Gray, Robert Coleman, Henry Gorin, John Taylor, H. C. Ewing, John S Anderson, William Hopper, John Mann and Joseph Frazer.

* Sir Joseph Banks ( 1743 – 1820 ), botanist

* Joseph Smith's First Vision ( 1820 )

* Joseph Jules Descamps, politician ( 1820 – 1892 ).

The Carbonari passed for the first time from words to action in 1820 in Naples by organizing anti-absolutist and liberal constitution riots that took inspiration from the one made at Cadiz on 1 January of the same year: the two officers Michele Morelli and Joseph Silvati ( which had the membership of former General Murat, as Guglielmo Pepe ) on July 1, marched towards the town of Nola in Campania at the head of their regiments of cavalry.

Joseph Wolf ( January 21, 1820 – April 20, 1899 ) was a German artist who specialized in natural history illustration.

Little Wolf ( Cheyenne: Ó ' kôhómôxháahketa, sometimes transcribed Ohcumgache or Ohkomhakit, more correctly translated Little Coyote, c. 1820 – 1904 ) was a Northern Cheyenne Chief.