It established a monarchical union at Lublin.
This country's system of Golden Liberty allowed monarchs to be elected by a parliament where every member had a right to individually veto legislation. This country was pillaged by a northern enemy during the Deluge, and its nobles joined a parliament with a J in its name, the Sejm ("SEY-m"). A post-Jagiellonian king of this nation allied with Leopold I to break the 1683 siege of Vienna. It established a monarchical union at Lublin. This country's three neighbors partitioned it out of existence by the 1790s. For 10 points, name this state ruled by Jan III Sobielski and King Poniatowski from Krakow and Warsaw.
This country's system of Golden Liberty allowed monarchs to be elected by a parliament where every member had a right to individually veto legislation.
Poland-Lithuania [or Polish-Lithuanian Commonwealth; or Commonwealth of Poland]