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Michał Kazimierz Radziwiłł

Prince
Prince Michał Kazimierz Radziwiłł was a Lithuanian noble. A member of the aristocratic Radziwiłł family, he was frequently referred to by his idiolect Rybeńko, to distinguish him from the other Michał Kazimierz Radziwiłł. Ordynat of Niasviž and... Wikipedia