Sejm of the Polish–Lithuanian Commonwealth
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The General Sejm was the bicameral legislature of the Polish–Lithuanian Commonwealth. It was established by the Union of Lublin in 1569 following the merger of the legislatures of the two states, the Sejm of the Kingdom of Poland and the Seimas of... Wikipedia
Chambers: Senate; Chamber of Deputies
King of Poland: Stanisław August Poniatowski; since 1764
Marshal of the Sejm: Stanisław Kostka Bieliński; since 1793
Senate voting system: Appointment by King