Ratification of Polish Constitution

Date: May 3, 1791 • Location: Kraków, Poland

The Great Sejm of the Polish–Lithuanian Commonwealth ratified the first codified national constitution in Europe.

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.