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 )

* 1803 – George James Webb, English composer ( d. 1887 )

Monroe was then appointed Minister to the Court of St. James ( Britain ) from 1803 to 1807.

When Audubon, at age 18, boarded ship for emigration to the United States in 1803, he changed his name to an anglicized form: John James Audubon.

Johann August Sutter ( February 15, 1803 – June 18, 1880 ) was a Swiss pioneer of California known for his association with the California Gold Rush by the discovery of gold by James W. Marshall and the mill making team at Sutter's Mill, and for establishing Sutter's Fort in the area that would eventually become Sacramento, the state's capital.

On Saturday, April 30, 1803, the Louisiana Purchase Treaty was signed by Robert Livingston, James Monroe, and Barbé Marbois in Paris.

After the Louisiana Purchase by the United States in 1803, this indefinite nature of the boundary between the U. S. and Spain led to an agreement on November 6, 1806, negotiated by Gen. James Wilkinson and Lt. Col. Simón de Herrera, to establish a neutral territory on both sides of the river.

Clay and his wife had eleven children ( six daughters and five sons ): Henrietta ( 1800 – 1801 ), Theodore ( 1802 – 1870 ), Thomas ( 1803 – 1871 ), Susan ( 1805 – 1825 ), Anne ( 1807 – 1835 ), Lucretia ( 1809 – 1823 ), Henry, Jr .( 1811 – 1847 ), Eliza ( 1813 – 1825 ), Laura ( 1815 – 1817 ), James Brown ( 1817 – 1864 ), and John ( 1821 – 1887 ).

— or — the meeting of Britannia & Citizen François ( 1803 ), James Gillray caricatured the peace between France and Britain.

The first person to separate the minerals was the British chemist and mineralogist James Smithson in 1803.

Pemberton was born to James Clifford Pemberton ( born 1803 in North Carolina ) and Martha L. Gant ( born 1803 in Virginia ), both of English descent.

* James Napper Tandy ( 1740 – 1803 ), member of the Society of United Irishmen

In 1772, Philip Embury conducted the first Methodist religious services in New Hampshire at the James Robertson farm in Chesterfield, and in 1803, Francis Asbury preached here.

The city was founded in 1803 by the Scioto Company led by James Kilbourne, who was later elected to the United States House of Representatives.

On May 7, 1803 James Kilbourne arrived at what is now Worthington to inspect the Scioto Company's purchase.

Dwight had eight sons: Timothy Dwight ( 1778 – 1844 ), a New Haven merchant and philanthropist ; Benjamin Woolsey Dwight ( 1780 – 1850 ), a New York physician ; educator and theologian ; twins James Dwight ( 1784 – 1863 ) and John Dwight ( 1784 – 1803 ); Sereno Edwards Dwight ( 1786 – 1850 ); clergyman William Theodore Dwight ( 1795 – 1865 ); Henry Edwin Dwight ( 1797 – 1832 ); and one who died young.

Eventually, the land was conveyed to James McCubbin Lingan in 1785, then to Captain George Calmes in 1803.

* James Douglas ( governor ) ( 1803 – 1877 ), Scottish-Canadian governor of the colony of Vancouver Island

* James Brooke ( 1803 – 1868 ), First Rajah of Sarawak

Barry, James ~ Self Portrait, 1803, oil on canvas, National Gallery of Ireland at Dublin

Physical Air ,— or — Britannia recover'd from a Trance ;— also, the Patriotic Courage of Sherry Andrew ; & a peep thro ' the Fog ( 1803 ) by James Gillray, showing Sheridan as a Silenus-like and ragged Harlequin defending Henry Addington and Lord Hawkesbury on the Dover coast from the advancing French rowboats filled with French soldiers, led by Napoleon.

James, Rajah of Sarawak, KCB ( born James Brooke ; 29 April 1803 – 11 June 1868 ) was a British adventurer whose exploits in areas of the British Empire led to him becoming the first White Rajah of Sarawak.

* In The Hand-Writing upon the Wall ( 1803 ), James Gillray caricatured Napoleon in the role of Belshazzar.