The Coup of 1809 also referred to as the Revolution of 1809 (Swedish: Revolutionen 1809) was a Swedish coup d'état by a group of noblemen resulting in the deposition of King Gustav IV Adolf of Sweden and the introduction of the Instrument of Government (1809). The coup was provoked by the disastrous Finnish War. The leaders of the coup are known in history collectively as 1809 års män (the Men of 1809).