The Great Sejm, also known as the Four-Year Sejm (Polish: respectively, Sejm Wielki or Sejm Czteroletni; Lithuanian: Didysis seimas or Ketveriu metu seimas) 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.