Events in the year 1820 in Portugal.
Incumbents Monarch: John VI
Events 22 January – Battle of Tacuarembó Liberal Revolution 24 August – Military revolt in Porto Establishment of a provisional junta of the Supreme Government of the Kingdom, in Porto 15 September – Military revolt in Lisbon Establishment of an interim government, in Lisbon 28 September – Establishment of a unified provisional junta 22 November – Instruções, first election law December – Cortes election
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