Albert Sidney Johnston ( February 2, 1803 – April 6, 1862 ) served as a general in three different armies: the Texas Army, the United States Army, and the Confederate States Army.

* 1803 – Louisiana Purchase: The United States purchases the Louisiana Territory from France for $ 15 million, more than doubling the size of the young nation.

* 1803 – Albrecht von Roon, Prussian soldier and statesman, 10th Prime Minister of Prussia ( d. 1879 )

* 1803 – Edward Beecher, American theologian ( d. 1895 )

* 1803 – Vladimir Odoevsky, Russian philosopher and writer ( d. 1869 )

In the mid-19th century important leaders included Transcendentalists such as Ralph Waldo Emerson ( 1803 – 1882 ) and Henry David Thoreau ( 1817 – 1862 ).

* 1803 – Joseph Paxton, English gardener and architect, designed The Crystal Palace ( d. 1865 )

* 1803 – Thousands of meteor fragments fall from the skies of L ' Aigle, France ; the event convinces European science that meteors exist.

* 1736 – Johann Christoph Kellner, German organist and composer ( d. 1803 )

* 1744 – Johann Gottfried Herder, German writer ( d. 1803 )

* 1803 – Luís Alves de Lima e Silva, Duke of Caxias, Brazilian military commander ( d. 1880 )

The Captainship General of Cuba, encompassing Cuba and the governorships of Florida ( safe the English occupation between 1763 – 83 ), Santo Domingo ( until 1795 ), Puerto Rico, and the entire Louisiana Territory ( 1763 – 1803 )

* 1803 – Lewis and Clark start their expedition to the west by leaving Pittsburgh, Pennsylvania at 11 in the morning.

* 1719 – Johann Wilhelm Ludwig Gleim, German poet ( d. 1803 )

* 1724 – Giovanni Battista Casti, Italian poet and author ( d. 1803 )

* 1882 – Ralph Waldo Emerson, American essayist ( b. 1803 )

* 1721 – Granville Leveson-Gower, 1st Marquess of Stafford, English politician ( d. 1803 )

During the Helvetic Republic ( 1798 – 1803 ), the county of Baden, the Freie Ämter and the region known as the Kelleramt were combined into the Canton of Baden.

** 1802 – 1803 Johann Heinrich Rothpletz ( b. 1766 – d. 1833 )

** 10 March 1803 – 26 April 1803 Johann Rudolf Dolder ( b. 1753 – d. 1807 )

In 1864 William Wallace Mitchell ( 1803 – 1884 ), a Glasgow Cotton Merchant, published his " Manual of Bowls Playing " following his work as the secretary formed in 1849 by Scottish bowling clubs which became the basis of the rules of the modern game.

The museum ’ s first notable addition towards its collection of antiquities, since its foundation, was by Sir William Hamilton ( 1730 – 1803 ), British Ambassador to Naples, who sold his collection of Greek and Roman artefacts to the museum in 1784 together with a number of other antiquities and natural history specimens.

Bulwer-Lytton was born on 25 May 1803 to General William Earle Bulwer of Heydon Hall and Wood Dalling, Norfolk and Elizabeth Barbara Lytton, daughter of Richard Warburton Lytton of Knebworth, Hertfordshire.

In an 1803 letter to William Henry Harrison, Jefferson wrote:

* 1857 – Douglas William Jerrold, English playwright and satirist ( b. 1803 )

In 1803, President Thomas Jefferson commissioned the Corps of Discovery, and named U. S. Army Captain Meriwether Lewis its leader, who selected William Clark as his partner.

It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston.

" In 1803, William Pitt the Younger, also a Tory, suggested to a friend that " this person generally called the first minister " was an absolute necessity for a government to function, and expressed his belief that this person should be the minister in charge of the finances.

It was discovered in 1803 by William Hyde Wollaston in one such ore, and named for the rose color of one of its chlorine compounds, produced after it reacted with the powerful acid mixture aqua regia.

Rhodium ( Greek rhodon ( ῥόδον ) meaning " rose ") was discovered in 1803 by William Hyde Wollaston, soon after his discovery of palladium.

In 1803, William Jessop opened the Surrey Iron Railway in south London, arguably the world's first horse-drawn public railway.

Buckminster's close associate William Ellery Channing ( 1780 – 1842 ) was settled over the Federal Street Church in Boston, 1803 ; and in a few years he became the leader of the Unitarian movement.

William Allen ( December 18 or 27, 1803 – July 11, 1879 ) was an Democratic Representative, Senator and 31st Governor of Ohio.

* October 5 – William Todd ( 1803 – 1873 ), American businessman, Canadian senate nominee ( b. 1803 )

* December 30 – William Hamilton, British diplomat and antiquary ( d. 1803 )

* July 10 – William Todd ( 1803 – 1873 ), American businessman, Canadian senate nominee

The state donated the property to Columbia and Union colleges in 1803, which sold it to William Ferris Pell in 1820.

On 24 December 1803, Jérôme married Elizabeth Patterson ( 1785 – 1879 ), daughter of Baltimore merchant William Patterson and his wife, Dorcas Spear.

Explorers William Clark and his slave York were members of the Lewis and Clark Expedition ( 1803 – 1805 ), and William's older brother, General George Rogers Clark -- conqueror of the old Northwest Territory and Revolutionary War hero.

* Goetzmann, William H. Army Exploration in the American West 1803 – 1863 ( Yale University Press, 1959 ; University of Nebraska Press, 1979 )

Meriwether Lewis passed the Guyandotte and Big Sandy River peninsula on or about September 20, 1803 on his way down the Ohio River before meeting up with William Clark in Clarksville, Indiana.

On January 14, 1803, the Governor of Indiana Territory, William Henry Harrison, issued a similar proclamation defining the boundaries as beginning at a point where an east and west line passing through the southernmost extreme of Lake Michigan would intersect a north and south line, passing through the westernmost extreme of the lake, then north to the territorial boundary, then along said boundary line to a point where an east and west line passing through the southerly extreme of Lake Michigan would intersect the same, then along this last mentioned line to the place of beginning.

* William Smith ( Ordnance ) ( 1721 – 1803 ), of Chichester, UK Treasurer of the Ordnance