The 1772 Instrument of Government (Swedish: regeringsform) was the constitution of the Kingdom of Sweden from 1772 to 1809. It was promulgated in the wake of the Revolution of 1772, a self-coup mounted by King Gustav III, and replaced the 1720 Instrument of Government, which had been in force for most of the Age of Liberty (1719-72). Although in theory the 1772 Instrument merely readjusted the balance of power between the Crown and the Riksdag of the Estates (Swedish Parliament), without changing Sweden's status as a constitutional monarchy, in practice it is generally seen as instituting an absolute monarchy, especially after its modification in 1789 by the Union and Security Act, which further strengthened royal power at the expense of the Riksdag. It remained in force throughout the Gustavian era, until replaced by the 1809 Instrument of Government as a result of the Coup of 1809.[1]