question: Who is the maternal grandmother of Janusz Aleksander Sanguszko?
context: Title: Janusz Aleksander Sanguszko
  Passage: Janusz Aleksander Sanguszko (5 May 1712, Lubartów – 14 September 1775, Dubno) was a magnate in the Polish-Lithuanian Commonwealth. He held the titles of miecznik and Court Marshal of Lithuania. He was not interested in politics, and spent most of his life using the fortunes previous members of the Sanguszko family gathered, spending it on his lavish lifestyle. Indebted, in 1753 he agreed to divide the "ordynacja ostrogoska" he inherited from his mother, Marianna Lubomirska, among the members and allies of the "familia". This decision, known as the "transakcja kolbuszowska", was opposed by the enemy of "familia", hetman Jan Klemens Branicki, and was finally accepted by the decision of Sejm (national parliament) in 1766. He married Konstancja Sanguszko in 1731 but separated after the wedding.
  Title: Marianna Lubomirska
  Passage: Princess Marianna Lubomirska( 1693–1729) was a Polish noblewoman magnate. She was heiress of large Ostróg estates. Daughter of Grand Marshal of the Crown Józef Karol Lubomirski, the son of Voivode of Kraków Aleksander Michał Lubomirski and Princess Helena Tekla Ossolińska and Princes Teofila Ludwika Zasławska, the daughter of Prince Władysław Dominik Zasławski and Katarzyna Sobieska( sister of King of Poland Jan III Sobieski).
answer: Teofila Ludwika Zasławska
citations: Janusz Aleksander Sanguszko Marianna Lubomirska