Overview
Countess Ludwika "Luds" Maria Poniatowska (30 November 1728 – 2 October 1804) was a Polish noblewoman, known as the sister of the King of Poland, Stanisław August Poniatowski.
Life
She was the daughter of Stanisław Poniatowski and Konstancja Czartoryska.
In 1745, she married Jan Jakub Graf Zamoyski, by whom she had an only daughter. The couple separated after the birth of their daughter in 1750.
In 1763, her brother was elected king of Poland. She and her sister Izabella Poniatowska both opposed her brother's suggested marriage to princess Sophia Albertina of Sweden.
From Wikipedia (CC BY-SA 4.0).