* Frederick William Cumberland ( 1821 – 1881 ), engineer and politician

The US natural gas industry started in 1821 at Fredonia, Chautauqua County, New York, when William Hart dug a well to a depth of into gas-bearing shale, then drilled a borehole further, and piped the natural gas to a nearby inn where it was burned for illumination.

The island's first known sighting by Europeans was on 21 August 1821 by the British ship Eliza Francis ( or Eliza Frances ) owned by Edward, Thomas and William Jarvis and commanded by Captain Brown.

* 1821 – William Poole, American gangster ( d. 1855 )

* 1821 – William Henry Vanderbilt, American businessman ( d. 1885 )

* 1821 – Princess Elizabeth of Clarence, daughter of King William IV, granddaughter of King George III ( b. 1820 )

* 1821 – William Jervois, English engineer and caption, 10th Governor of South Australia ( d. 1897 )

* William I, Elector of Hesse ( 1743 – 1821 )

William Gladstone was educated from 1816 to 1821 at a preparatory school at the vicarage of St Thomas's Church at Seaforth, close to his family's residence, Seaforth House.

* December 8 – William Henry Vanderbilt, American entrepreneur ( b. 1821 )

* December 11 – William Milligan, Scottish theologian ( b. 1821 )

* March 8 – William Poole, infamous member of New York City's Bowery Boys gang ( b. 1821 )

In 1821 William Conybeare and Henry De la Beche, both members of the Geological Society of London, collaborated on a paper that analysed in detail the specimens found by Anning and others.

William Conybeare named it Plesiosaurus ( near lizard ) because he thought it more like modern reptiles than the ichthyosaur had been, and he described it in the same 1821 paper he co-authored with Henry De la Beche on ichthyosaur anatomy.

This period included a panoply of international ‘ great demographers ’ like Adolphe Quételet ( 1796 – 1874 ), William Farr ( 1807 – 1883 ), Louis-Adolphe Bertillon ( 1821 – 1883 ) and his son Jacques ( 1851 – 1922 ), Joseph Körösi ( 1844 – 1906 ), Anders Nicolas Kaier ( 1838 – 1919 ), Richard Böckh ( 1824 – 1907 ), Émile Durkheim ( 1858-1917 ), Wilhelm Lexis ( 1837 – 1914 ) and Luigi Bodio ( 1840 – 1920 ) contributed to the development of demography and to the toolkit of methods and techniques of demographic analysis.

The first white settler in the area that would become Montgomery County was William Offield, earlier of Tennessee, who arrived in 1821 with his wife Jennie ( née Laughlin ) and one child and settled near the confluence of Offield Creek and Sugar Creek, about five miles ( 8 km ) southwest of Crawfordsville.

* William Irving ( New York ), ( 1766 – 1821 ), U. S. Congressman from New York

* William Thomas Mercer ( 1821 – 1879 ), British Colonial Secretary in Hong Kong, 1859 – 1868

For about 40 years William Kelly ( 1821 – 1906 ) was his chief interpreter and continued to be a staunch supporter until his own death.

During 1821 the President of the Board of Trade, William Huskisson, composed a Commons Committee report which recommended a return to the " practically free " trade of the pre-1815 years.

Its most notable member was the classicist William Kelly ( 1821 – 1906 ).

* William Smith ( congressman ), member of the U. S. House of Representatives from Virginia ( 1821 – 1827 )

* William Durkee Williamson ( 1779 – 1846 ) a governor of Maine ( 1821 ) was born in town.

In 1821, William and Jennie Offield had built a cabin on a little creek, later to be known as Offield Creek, four miles southwest of the future site of Crawfordsville.

People starting with John Oxley in 1817, 1818 and 1821, followed by Charles Sturt in 1829 – 1830 attempted to follow the westward-flowing rivers to find an " inland sea ", but these were found to all flow into the Murray River and Darling River which turn south.

This lasted nearly three centuries, until a rebellion ( which followed closely on the heels of the Mexican War of Independence ) in 1821.

This date followed the establishment by the United States of America of diplomatic relations with the modern nation of Greece, following the Greek War of Independence ( 1821 – 1830 ).

This was followed by the construction of a county courthouse and jail in 1821, the courthouse being design by well-known architect Robert Mills ( architect ).

The example of Great Britain was then followed by the following countries in abolishing slavery within their dominions: in 1848 the slaves in all France's colonies were immediately emancipated ; in 1853 the Dutch commenced emancipation of slaves within their possessions ; in 1858 it was enacted that every slave belonging to a Portuguese subject should be freed within 20 years and, from 29 April 1878, slavery became illegal throughout Portuguese possessions ; the government of Buenos Aires enacted that all children of slaves after the 31 January 1813 should be free ; in Columbia those born after 16 July 1821 were to be liberated upon attaining 18 and Mexico ended slavery on 15 September 1829.

In 1821, the city followed Comitán de Domínguez ’ declaration of independence from Spain and the Captaincy General of Guatemala.

Four novels followed: Valerius in 1821, Some passages in the Life of Adam Blair, Minister of Gospel at Cross Meikle in 1822, Reginald Dalton in 1823 and Matthew Wald in 1824.

In 1821, his " Travels in Palestine " were published, followed by " Travels Among the Arab Tribes " in 1825.

Again engraved by Rowlandson himself in 1812, and issued under the title of the Tour of Dr Syntax in Search of the Picturesque, they had attained a fifth edition by 1813, and were followed in 1820 by Dr Syntax in Search of Consolation, and in 1821 by the Third Tour of Dr Syntax in Search of a Wife.

The unsuccessful Tudor Vladimirescu's rebellion in 1821 was followed by the Revolutions of 1848 in Moldavia, Wallachia, and Transylvania which sought complete independence for the first two and national emancipation in the third.

In 1821, author Catharine Sedgwick moved here, followed by actress Fanny Kemble.

Francia initially abandoned it in 1815, then in 1821 built a fort on the border, followed by another one the next year, and a third in 1832.

This success was followed up by the production of the Comédiens ( 1820 ), an inferior play, with little plot, and the Paria ( 1821 ), which contained some well-written choruses.

Beethoven followed his example with the idealistic Fidelio ; and with Der Freischütz of 1821, Weber established a uniquely German form of opera under the influence of Romanticism.

James Blackman was the first European settler to cross the Cudgegong River in 1821 followed quickly by Lieutenant William Lawson who was then commandant of Bathurst.

Golovnin's son, Alexander Vasilyevich Golovnin ( 1821 – 1886 ), initially followed in his father's footsteps, serving in the Russian Navy.

Carey's second wife, Charlotte, died in 1821, followed by his eldest son Felix.

In 1819, Herten joined the Recklinghausen Bürgermeisterei, and Erkenschwick followed in 1821.

It was followed by many good 18th-century editions, crowned by Edmund Malone's landmark Variorum Edition, which was published posthumously in 1821 and remains the basis of modern editions.

In 1819 and 1820, Captain Warrington commanded Java, followed by Guerriere in 1820 and 1821.

) Four more volumes followed, in 1818, 1821, 1824, and 1828.

Then, three more volumes followed in 1985, 1987 and 1988 bringing a total of 11: Volume VIII ( 1851 to 1860 ) with 521 biographies ; Volume VI ( 1821 to 1835 ) with 479 biographies ; Volume VII ( 1836 to 1850 ) with 538 biographies.

Pioneer settlers followed in the early 1820s with William Davis receiving the first land grant in 1821, followed by John Ritchie and John Cullen shortly afterwards.