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Zasławski (plural Zasławscy) is a surname of Polish– Ruthenian nobility and a cadet branch of the Ostrogski family. The Zasławski family had its power base in Volhynia, Crown of the Kingdom of Poland (today in Ukraine), and traced its origins to a branch of the Rurikids that took a name from the Iziaslav. Due to their relation to the Rurikids, they held title of Knyaz (Prince).