Helena Radziwiłłowa
Helena Radziwiłłowa was a Polish aristocrat.
She was, for a period, a lady-in-waiting to Catherine the Great. She married the Polish magnate and politician Michał Hieronim Radziwiłł in 1771. She was widely known for her love affairs and was the lover of Stanisław August Poniatowski as well as of Otto Magnus von Stackelberg, who benefitted the career of her spouse.