1820

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( 1820s: )     1820
The Cato Street conspirators are captured.
year 1820

Events

• January 1 – Trienio Liberal in Spain: A constitutionalist military insurrection at Cádiz leads to the summoning of the Spanish Parliament (March 7).
• January 29 – George IV of the United Kingdom ascends the throne, on the death at Windsor Castle of his father George III (after 59 years on the throne), ending the period known as the British Regency. There will be a gap of 21 years before the title Prince of Wales is next used.
• February 23 – Cato Street Conspiracy: A plot to murder the Cabinet of the United Kingdom is exposed in England; the principals are the last to suffer decapitation, following their hanging for treason outside Newgate Prison in London, on May 1.
• March 10 – The Royal Astronomical Society is founded in London.
• April 1 – A proclamation, signed "By order of the Committee of Organisation for forming a Provisional Government", begins the "Radical War" in Scotland.
• April 12 – Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.
• May 1 – The last hanging, drawing and quartering in Britain is meted out to the Cato Street conspirators for treason (only hanged and beheaded).
• May 20 – John Stuart Mill sets out on his formative boyhood trip to France.
• June 5 – Caroline of Brunswick, the estranged wife of King George IV of the United Kingdom, returns to England after six years abroad in Italy, where she had been carrying on an affair; since ascending the throne in January, the King has sought to receive his government's approval for a divorce.
• June 10 – Sir Thomas Munro is appointed as the British colonial Governor of the Madras Presidency, which encompasses most of southern India.
• June 12 – Élie Decazes, leader of the opposition in France's Chamber of Deputies, successfully introduces the "Law of the Double Vote", a proposal to add to the 258 existing legislators by creating 172 seats that would be "selected by special electoral colleges" made up of the wealthiest 25% of voters in each of France's departments.
• July – A revolt under Guglielmo Pepe forces Ferdinand I of the Two Sicilies to sign a constitution modeled on the Spanish Constitution of 1812.
• July 20 – Saint Cronan's Boys' National School opens in Bray, Co. Wicklow, Ireland under the title Bray Male School. It is the oldest school in Bray, and its notable pupils will include President of Ireland Cearbhall Ó Dálaigh.
• September 15 – Revolution breaks out in Lisbon, against John VI of Portugal.
• October 9 – Guayaquil declares independence from Spain.
• October 25 – November 20 – The Congress of Troppau (Opava) is convened between the rulers of Russia, Austria and Prussia.
• December 3 – U.S. presidential election, 1820: James Monroe is re-elected, virtually unopposed.

Date unknown

• The Argentine Confederation (Argentina) establishes a penal colony in the Falkland Islands.
• Robert Owen devises the labour voucher.
• 18,957 black slaves leave Luanda, Angola.
• The 6th edition of the Encyclopædia Britannica appears.
• Construction work is completed on the Citadelle Laferrière in Haiti, the largest fortification in the Americas.

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Event

Event
Pax Brittanica

 

A Birth

Title	Born	Place of birth	Died	Summary
Friedrich Engels	28 November 1820	Barmen Prussia	5 August 1895	Author Socialism