Princess Katarzyna Ostrogska was a Polish–Lithuanian noblewoman, founder of the city of Biała. She was the maternal grandmother of King of Poland Michał Korybut Wiśniowiecki.

Michał Korybut Wiśniowiecki, also known as Michał Tomasz Wiśniowiecki, and under a regal name Michael, was the ruler of the Polish–Lithuanian Commonwealth as King of Poland and Grand Duke of Lithuania