The Great Sejm, also known as the Four-Year Sejm was a Sejm (parliament) of the Polish–Lithuanian Commonwealth that was held in Warsaw between 1788 and 1792. Its principal aim became to restore sovereignty to, and reform, the Commonwealth politically and economically.
Great, or Four-Year, Sejm (1788–92) and Senate adopt Constitution of 3 May 1791 at the Royal Castle in Warsaw.