Countess Maria Zofia Czartoryska (née Sieniawska; 15 April 1699 – 21 May 1771) was a Polish noblewoman (szlachcianka). By birth she was member of powerful Sieniawski family and by marriage she was member of House of Dönhoff and House of Czartoryski.
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Early life
Countess Zofia was daughter of Count Adam Mikołaj Sieniawski and Princess Elżbieta Lubomirska.
First marriage
She married firstly Count Stanislaus Ernst von Dönhoff in 1724. She was his second wife. He was previously married to his cousin, Countess Johanna Katharina von Dönhoff (1686–1723). Zofia's stepdaughter Countess Konstanza von Dönhoff later married Prince Janusz Aleksander Sanguszko.
Inheritance
After her father's death in 1726, Zofia inherited his Ruthenian estates including 35 towns, 235 villages and Berezhany fortress, she was also the only heir of her first husband's estates and of her mother's fortune.