Konstantin Ostrozhsky
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Konstantin Ostrozhsky (kniaz) in Russian and Ukrainian historiography may refer to one of the following:
- Kniaz Konstantin Ivanovich Ostrozhskiy, also known as Konstanty Ostrogski, (1463 - 1533) who was a Hetman of Lithuania
- Kniaz Konstantin Konstantinovich Ostrozhskiy, also known as Konstanty Wasyl Ostrogski (? - 1608), the son of the above Knyaz Konstantin Ivanovich Ostrozhskiy