1st January » The Greek Constitution of 1822 is adopted by the First National Assembly at Epidaurus.
9th January » The Portuguese prince Pedro I of Brazil decides to stay in Brazil against the orders of the Portuguese King João VI of Portugal known as João VI, beginning the Brazilian independence process.
13th January » The design of the Flag of Greece or Greek flag is adopted by the First National Assembly at Epidaurus.
14th January » Greek War of Independence: Acrocorinth is captured by Theodoros Kolokotronis and Demetrios Ypsilantis.
15th January » Greek War of Independence: Demetrios Ypsilantis is elected president of the legislative assembly.
24th February » The first Swaminarayan temple in the world, Shri Swaminarayan Mandir, Ahmedabad, is inaugurated.
30th March » The Florida Territory is created in the United States.
31st March » Chios Massacre named The massacre of the population of the Greek island of Chios by soldiers of the Ottoman Empire following an attempted rebellion, depicted by the French artist Eugène Delacroix.
16th May » Greek War of Independence: The Turkey named Turks capture the Greek town of Souli.
24th May » Battle of Pichincha: Antonio José de Sucre secures the independence of the Presidency of Quito.
14th June » Charles Babbage proposes a difference engine in a paper to the Royal Astronomical Society entitled "Note on the application of machinery to the computation of astronomical and mathematical tables".
2nd July » Thirty-five slaves are hanged in South Carolina, including Denmark Vesey, after being accused of organizing a slave rebellion.
8th July » Chippewas turn over a huge tract of land in Ontario to the United Kingdom.
26th July » José de San Martín arrives in Guayaquil, Ecuador, to Guayaquil conference called meet with Simón Bolívar.
26th July » First day of the three-day Battle of Dervenakia, between the Ottoman Empire force led by Mahmud Dramali Pasha and the Greek War of Independence named Greek Revolutionary force led by Theodoros Kolokotronis.
7th September » Pedro I of Brazil named Dom Pedro I declares Independence of Brazil known as Brazil independent from Portugal on the shores of the Ipiranga Brook in São Paulo.
27th September » Jean-François Champollion announces that he has deciphered the Rosetta stone.
12th October » Peter I of Brazil is proclaimed the emperor of the Brazilian Empire called Brazil.
19th October » In Parnaíba; Simplício Dias da Silva, João Cândido de Deus e Silva and Domingos Dias declare the independent state of Piauí.
25th October » Greek War of Independence: The First Siege of Missolonghi begins.
31st October » Emperor Agustín de Iturbide attempts to dissolve the Congress of the First Mexican Empire known as Mexican Empire.
9th November » The Action of 9 November 1822 between USS Alligator 1820 6 and a squadron of pirate schooners off the coast of Cuba.
16th November » American Old West: Missouri trader William Becknell arrives in Santa Fe, New Mexico, over a route that became known as the Santa Fe Trail.
1st December » Pedro I of Brazil or Peter I is crowned Emperor of Brazil.