Wikipedia
Chajka
Chajka (Czajka) (d. after 14 November 1781) – daughter of Lithuanian merchant Abramek Lwowski, mistress of Polish king Stanisław August Poniatowski.
She was Jewish. She lived in Żwaniec. In 1781 she was portrayed by Krzysztof Radzwiłłowski. She had a daughter named Elia (Ella).