Ecuador gained independence from Spain
September 7 - Proclamation of independence of Brazil by its future emperor Pedro I.
Joseph Fourier established the law of proportionality of the heat flux to the temperature gradient - Fourier's law.
Jean-François Champollion deciphered the ancient Egyptian inscription on the Rosetta Stone.
See also: Category: 1822 births
January 6 - Schliemann Heinrich, American archaeologist of German descent
January 12 - Lenoir Etienne, Belgian inventor, designer of the first practically suitable internal combustion engine († 1860)
April 26 - Olmsted Frederick, American landscape architect
April 27 - Ulysses Grant, 18th President of the United States (1869-1877)
May 31 - Edward Dembowski, Polish philosopher, journalist, revolutionary
July 22 - Gregor Mendel, Austrian Augustinian monk, botanist, discovers the laws of heredity
See also: Category: Died 1822
June 25 - Aodo Denzen, Japanese Western-style artist, master of copper engraving.