* Henry Austin ( architect ) ( 1804 – 1891 ), American architect

* 1857 – Eugène Sue, French novelist ( b. 1804 )

* 1866 – Gábor Klauzál, Hungarian politician ( b. 1804 )

Aga Khan I (; or, less commonly but more correctly (; ), was the title accorded to Hasan Ali Shah (; ; 1804 in Kohak, Iran – 1881 in Bombay, India ), the governor of Kirman, 46th Imam of the Nizari Ismaili Muslims, and prominent Muslim leader in Iran and later in the Indian Subcontinent.

Theseus Fighting the Centaur ( 1804 – 1819 ), Kunsthistorisches Museum, Vienna.

* 1804 – Francis II assumes the title of first Emperor of Austria.

* 1804 – High Possil Meteorite: The first recorded meteorite in Scotland falls in Possil.

At his memorial service on 22 June 1825 his own Requiem in C minor — composed in 1804 – was performed for the first time.

* 1804 – The western Georgian kingdom of Imereti accepts the suzerainty of the Russian Empire

* 1804 – Toussaint Louverture, Haitian Revolutionary ( b. 1743 )

* 1885 – Karl Theodor Ernst von Siebold, German physiologist ( b. 1804 )

" Migration, Radicalism, and State Security: Legislative Initiatives in the Canada and the United States c. 1794 – 1804 " in Studies in American Political Development, Volume 16, Issue 1, April 2002, 48 – 60

The term acquired a special significance in the philosophy of Immanuel Kant ( 1724 – 1804 ), who used it to describe the equally rational but contradictory results of applying to the universe of pure thought the categories or criteria of reason that are proper to the universe of sensible perception or experience ( phenomena ).

Benjamin Disraeli, 1st Earl of Beaconsfield, KG, PC, FRS, ( 21 December 1804 – 19 April 1881 ) was a British Prime Minister, parliamentarian, Conservative statesman and literary figure.

He was crowned Emperor of the French and ruled from 1804 – 1814, 1815.

* Napoleon I ( 1804 – 1814, 1815 ), also King of Italy ( 1805 – 1814 ) and Emperor in Elba ( 1814 – 1815 )

#** Laetitia Christine Bonaparte ( 1804 – 1871 )

#* Napoleon Louis Bonaparte ( 1804 – 1831 )

* Napoleon Bonaparte ( First Consul ), Jean-Jacques Cambacérès ( Second Consul ), Charles-François Lebrun ( Third Consul ), Consuls ( 12 December 1799 – 18 May 1804 )

The current resistance to Russian rule has its roots in the late 18th century ( 1785 – 1791 ), a period when Russia expanded into territories formerly under the dominion of Turkey and Persia ( see also the Russo-Turkish Wars and Russo-Persian War ( 1804 – 1813 )), under Mansur Ushurma — a Chechen Naqshbandi ( Sufi ) Sheikh — with wavering support from other North Caucasian tribes.

In 1842 Charlotte and Emily travelled to Brussels to enrol in a boarding school run by Constantin Heger ( 1809 – 96 ) and his wife Claire Zoé Parent Heger ( 1804 – 87 ).

The first individual alkaloid, morphine, was isolated in 1804 from opium poppies | poppy ( Papaver somniferum ).

The boomerang was first encountered by western people at Farm Cove ( Port Jackson ), Australia, in December 1804 where its use as a weapon was witnessed during a tribal skirmish:

* French group, under which they also included the countries that codified their law either in 19th or in the first half of the 20th century, using the Napoleonic code civil of year 1804 as a model ; this includes countries and jurisdictions such as Italy, Portugal, Spain, Louisiana, states of South America ( such as Brazil ), Quebec, Santa Lucia, Romania, the Ionian Islands, Egypt, and Lebanon

* 1804 – At Notre Dame Cathedral in Paris, Napoleon Bonaparte crowns himself Emperor of the French, the first French Emperor in a thousand years.

), the first Emperor of Austria ( Kaiser von Österreich ), ruling from 1804 to 1835, so later he was named the one and only Doppelkaiser ( double emperor ) in history.

The French National Convention, the first elected Assembly of the First Republic ( 1792 – 1804 ), on the 4th of February 1794, under the leadership of Maximilien Robespierre, abolished slavery by law in France and all its colonies.

Jean Jacques Dessalines became Haiti's first emperor in 1804.

On May 1, 1804, the first group of emigrants departed for the United States.

Rapp was able to secure a large tract of land in Pennsylvania and started his first commune, known as Harmonie or Harmony, in Butler County, Pennsylvania, where the Society existed from 1804 to 1815.

They first settled and built the town of Harmony, Pennsylvania, in 1804, and established the Harmony Society in 1805 as a religious commune.

The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition ( 1804 – 1806 ), was the first transcontinental expedition to the Pacific coast undertaken by the United States.

In 1804 Haiti became the first independent black state in the New World.

The first steam locomotive was built by Richard Trevithick ; it first ran on 21 February 1804, although it was some years before steam locomotive design became economically practical.

This observation was first made by the French chemist Joseph Proust, based on several experiments conducted between 1798 and 1804.

John Dalton first expressed this observation in 1804.

" On the other hand Clement Greenberg called Immanuel Kant ( 1724 – 1804 ) " the first real Modernist ", though he also wrote, " What can be safely called Modernism emerged in the middle of the last century — and rather locally, in France, with Baudelaire in literature and Manet in painting, and perhaps with Flaubert, too, in prose fiction.

It was first isolated in 1804 by Friedrich Sertürner, first distributed by him in 1817, and first commercially sold by Merck in 1827, which at the time was a single small chemists ' shop.

The black-tailed prairie dog ( Cynomys ludovicianus ) was first described by Lewis and Clark in 1804 during the Lewis and Clark Expedition.

In 1804 his unnamed steam locomotive hauled a train along the tramway of the Penydarren ironworks, near Merthyr Tydfil in Wales.

* September 25 – Nicolas-Joseph Cugnot, French steam vehicle pioneer ( d. 1804 )

In 1804, Richard Trevithick, in the first recorded use of self propelled steam power on a railway, ran a high-pressure steam locomotive with smooth wheels, on an ' L ' section plateway near Merthyr Tydfil, but it was found more expensive than horses.

Since 1804, the mine owner, Christopher Blackett had been investigating the possibilities of working the mine's short colliery tramroad by steam traction.

Richard Trevithick | Trevithick's locomotive, 1804 the first successful steam locomotive

In 1804, Richard Trevithick designed and built the first ( unnamed ) steam locomotive to run on smooth rails.

On 10 February 1804, a young engineer, Richard Trevithick, drove the world's first ever steam locomotive along a track at the Penydarren ironworks, near Merthyr Tydfil.

This was used by Richard Trevithick to demonstrate a pioneer locomotive in 1804, using one of his high pressure steam engines, but the engine was so heavy that it broke many of the rails.

Since the invention of the very first railway steam locomotive in 1804, railway companies have applied names to their locomotives, carriages and multiple units.

The village was the terminus of the world's first steam railway journey when on 21 February 1804 the inventor Richard Trevithick drove a steam locomotive hauling both iron and passengers travelled from the Penydarren ironworks in Merthyr Tydfil to the basin of the Glamorganshire Canal at Abercynon.