The Constitution of May 3, 1791 (Konstytucja Trzeciego Maja) was drafted between October 6, 1788, and May 3, 1791, when it was adopted by the Great Sejm of the Polish–Lithuanian Commonwealth . The contitution’s adoption was preceded by a period of agitation with the Convocation Sejm of 1764 and the election of Stanisław August Poniatowski as the Commonwealth’s last elective monarch.
The constitution had sought to prevail over and eliminate the anarchy, caused by the Liberum Veto, which had put the Country/King at the mercy of any single Sejm deputy who chose, or was bribed by an internal interest or external foreign power, to undo all the legislation that had been passed by the Sejm. The constitution’s adoption met with immediate hostilities, both political and military by the Commonwealth’s neighbors. In the War in Defense of the Constitution, the Commonwealth’s ally Prussia, broke its alliance with the Polish-Lithuanian Commonwealth, which was effectively defeated by the three Empires: Russia, Prussia, & Austria-Hungary (aka Hapsburg).
[NOTE the parallels between this Sejm's use of liberum veto and the U.S. Congresses of 2008-present who have abused/utilized omni-present obstructionist tools: filibuster and cloture to keep the Obama administration for achieving its goals.]
British historian, Norman Davies describes the legal document as “the first constitution of its type in Europe”; Other historians documented it as the world’s second oldest codified national constitution after the U.S. Constitution, which was effective on March 4, 1789 — just two years earlier.
The Commonwealth’s 1791 Constitution remained in effect for all of 14 months and 3 weeks. It would be a long time until the Second Republic would re-emerge after World War I and Poland would re-appear and be a free republic again.
[Source Material from Wikipedia]