The Ostrog entail was founded by prince Janusz Ostrogski with the consent of the Polish Sejm in 1609. It was to include Ostrogski’s estates situated in Volyhnia, Kiev, Sandomierz and Krakow provinces. The Ostrog entail came into the hands of the Sanguszko princes through Paweł Karol Sanguszko's (1680-1750) second wife, Marianna née Lubomirska Sanguszko (d. 1729), daughter of Józef Karol Lubomirski and Teofila née Zasławska, and sister of Aleksander Dominik Lubomirski, the entailer of Ostrog. On her brother's death in 1720 she came into possession of the Ostrog Entail. Goods comprising the Ostrog entail were mentioned in the last will of prince Paweł Karol Sanguszko indicating they belonged to his son Janusz Aleksander.
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