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3 December: Invasion of Isle de France – British forces oblige the French to surrender Isle de France (Mauritius).

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3 December: Invasion of Isle de France – British forces oblige the French to surrender Isle de France (Mauritius).

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20–27 August – Battle of Grand Port: The Frenchforce the Royal Navy fleet attempting to blockade a harbour on Isle de France
(Mauritius) to surrender.

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October – King George III recognised as insane.

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10 November – Paisley canal disaster in Scotland: A pleasure craft capsizes with the loss of 84 lives.

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17 November – Anglo-Swedish War: Swedendeclares war on the United Kingdom.29 November –

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Peterloo Massacre of August 16, 1820. 23 February: A plot to murder the Cabinet, the Cato Street conspiracy, is exposed.

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1 August: Regent's Canal opens from Camden to Limehouse Basin, c. September: John Constable begins painting on Hampstead Heath regularly, Approximate date: Clerkenwell Prison in operation

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Geographical Society of London established learned society and
professional body for geography

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Britain defeated China in the Opium War and made China sign the Treaty of Nanking. Britain was given Hong Kong.

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16 December – last hanging for piracy at Execution Dock,  Wapping  in London.

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26 June – King George IV dies and is succeeded by his younger brother William IV. [3]  From
this time the sum voted by Parliament for the civil list is restricted to the expenses of
the Royal Household, removing any residual Crown responsibilities for the cost of civil
government.

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February 6 - Britain claims New Zealand as a colony to head off proposed French settlements

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Charles Dickens published A Christmas Carol. It sold out completely in 6 days

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10 March: Astronomical Society of London established,1 May: The Cato Street conspirators are the last to suffer decapitation following their hanging for treason outside Newgate Prison.

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Assassination attempt on Queen Victoria by John Francis.