Question: What was the king whose mistress was Elżbieta Branicka criticized of as the last king of the Commonwealth?
Sentence (from "Stanisław August Poniatowski"): Stanisław II Augustus (also Stanisław August Poniatowski; born Stanisław Antoni Poniatowski; 17 January 1732 – 12 February 1798) was the last King of Poland, Grand Duke of Lithuania and the last monarch of the united Polish–Lithuanian Commonwealth (1764–95).
Relevant evidence: Yes