Question: What is the date of death of Michał Grabowski's father?
Sentence (from "Stanisław August Poniatowski"): Stanisław II Augustus (also Stanisław August Poniatowski; born Stanisław Antoni Poniatowski; 17 January 1732 – 12 February 1798), who reigned as King of Poland and Grand Duke of Lithuania from 1764 to 1795, was the last monarch of the Polish–Lithuanian Commonwealth.
Relevant evidence: Yes