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Stanisław August Poniatowski (born Stanisław Antoni Poniatowski; January 17, 1732-February 12, 1798) was the last King of the Polish-Lithuanian Commonwealth (1764-1795).
He was the son of Stanisław Poniatowski, Castellan of Kraków, and Konstancja Czartoryska, brother of Michał Jerzy Poniatowski, primate of the Roman Catholic Church in Poland, and uncle of Prince Józef Poniatowski.
Poniatowski was briefly a prisoner after being kidnapped by members of the Confederation in 1771, and held outside of Warsaw.