Its principal aim became to reform and restore sovereignty to the Commonwealth .
The Great Sejm , or Four - Year Sejm , was a sejm ( diet or parliament ) of the Polish -- Lithuanian Commonwealth that was held in Warsaw between 1788 and 1792 .
Its principal aim became to reform and restore sovereignty to the Polish -- Lithuanian Commonwealth .
The Great Sejm , or Four - Year Sejm , was a sejm ( diet or parliament ) of the Polish -- Lithuanian Commonwealth that was held in Warsaw between 1788 and 1792 .