in Tsarskoe Selo , commemorating the end of the Russo-Turkish War.]]
Year (''' MDCCLXXIV ''') was a Common Year Starting On Saturday (link will display the full calendar) of the Gregorian Calendar (or a Common Year Starting On Wednesday of the 11-day slower Julian Calendar ).
- 1 August - The element Oxygen is discovered for the third (and last) time—the second quantitatively following the somewhat earlier work of Carl Wilhelm Scheele (1771-1772)— by Joseph Priestley who publishes the fact in 1775 and so named the element and usually gets all the credit.
- October 14 - Document Congress in America Adpoted-Decloration and Resolves.
- February 11 - Hans Jarta , Swedish political activist and administrator (d. 1847 )
- February 24 - Prince Adolphus, 1st Duke Of Cambridge (d. 1850 )
- March 9 - Mayhew Folger , whaler, captain of '' Topaz '' (ship), rediscovered Pitcairn Islands in 1808 (d. 1828 )
- March 16 - Captain Matthew Flinders , English explorer (d. 1814 )
- July 20 - Auguste Marmont , French marshal (d. 1852 )
- August 12 - Robert Southey , English poet and biographer (d. 1843 )
- August 28 - Elizabeth Ann Seton , co-founder of Mount Saint Mary's University , founder of the Sisters Of Charity (d. 1821 )
- September 5 - Caspar David Friedrich , German artist (d. 1840 )
- September 26 - Johnny Appleseed (John Chapman), nurseryman/missionary planted Apple-tree nurseries in Ohio , Indiana , and Illinois (d. 1847 )
- ''date unknown'' - Sergei Nikolayevich Glinka - Russia n author, brother of Fedor Nikolaevich Glinka (d. 1847 )
: ''See also .''
- January 21 - Mustafa III , Ottoman Sultan (b. 1717 )
- February 4 - Charles Marie De La Condamine , French mathematician and geographer (b. 1701 )
- April 4 - Oliver Goldsmith , English writer (b. 1730 )
- May 4 - Anthony Ulrich II, Duke Of Brunswick-Lüneburg (b. 1714 )
- May 10 - King Louis XV Of France (b. 1710 )
- July 1 - Henry Fox, 1st Baron Holland , English statesman (b. 1705 )
- July 11 - Sir William Johnson, 1st Baronet , Irish-born New York pioneer
- July 14 - James O'Hara, 2nd Baron Tyrawley And Kilmaine , British field marshal (b. 1682 )
- August 11 - Tiphaigne De La Roche , French writer (b. 1722 )
- August 14 - Johann Jakob Reiske , German scholar and physician (b. 1716 )
- August 25 - Niccolò Jommelli , Italian composer (b. 1714 )
- September 22 - Pope Clement XIV (b. 1705 )
- September 25 - John Bradstreet , Canadian-born soldier (b. 1714 )
- October 23 - Michel Benoist , French Jesuit missionary and scientist (b. 1715 )
- November 22 - Robert Clive, 1st Baron Clive , British general and statesman (b. 1725 )
- December 2 - Johann Friedrich Agricola , German composer (b. 1720 )
- December 16 - François Quesnay , French economist (b. 1694 )
: ''See also .''
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