Michał Kazimierz "Rybeńko" Radziwiłł

This article is about the 18th-century Polish-Lithuanian Commonwealth prince. For the 17th-century prince with a similar name, see Michał Kazimierz Radziwiłł.
Michał Kazimierz "Rybeńko" Radziwiłł
Born (1702-06-13)June 13, 1702
Died May 15, 1762(1762-05-15) (aged 59)
Spouse(s) Urszula Franciszka Wiśniowiecka
Anna Luiza Mycielska
Children with Urszula Franciszka Wiśniowiecka:
Michal Krzysztof Radziwiłł
Janusz Tadeusz Radziwiłł
Karol Stanisław Radziwiłł
Anna Radziwiłł
Ludwika Radziwiłł
Teofilia Konstancja Radziwiłł
Katarzyna Karolina Radziwiłł
with Anna Luiza Mycielska:
Weronika Joanna Radziwiłł
Hieronim Wincenty Radziwiłł
Maria Wiktoria Radziwiłł
Józefina Radziwilłł
Konstancja Radziwiłł
Parent(s) Karol Stanisław Radziwłł
Anna Katarzyna Sanguszko

Prince Michał Kazimierz Radziwiłł (Lithuanian: Mykolas Kazimieras Radvila , Belarusian: Міхал Казімер Радзівіл; 1702, Olyka 1762) was a Polish–Lithuanian noble. A member of the aristocratic Radziwiłł family, he was frequently referred to by his idiolect Rybeńko (Рыбанька), to distinguish him from the other Michał Kazimierz Radziwiłł. Ordynat of Niasviž and Olyka, owner of Biržai, Dubingiai, Slutsk, Kopyła and Shumsk.

He was a koniuszy of Lithuania since 1728, Court Marshal of Lithuania since 1734, Field Hetman of Lithuania and castellan of Trakai (Troki) since 1737, castellan of Vilnius since 1742, voivode of Vilnius and Grand Hetman of Lithuania since 1744. Like his father, he was the starost of a number of towns, including Przemyśl, Bratslav, Kamianets-Podilskyi, Człuchów, Krzyczów, Ovruch, Nowy Targ, Parczew, Osiek and Kaunas.

On April 23, 1725 in Bilokrynytsia (pol. Biala Krynica) he married Urszula Franciszka Wiśniowiecka. Later married Anna Luiza Mycielska on January 2, 1754 in Lviv. Awarded with the Order of the White Eagle in August 1727.

The treatment of his medical problems included 56 bleedings, 30 applications of leeches, and 13 cuppings. These treatments have been described as illustrative demonstrations of medical interventions available to the wealthy at the time.[1]

His former lover was Maria Karolina Sobieska, grand daughter of John III Sobieski.


  1. Zuba K. (2001). "[The treatment of "Rybenka": therapies and medical operations on Michał Kazimierz Radziwiłł, 1702-1762]". Med Nowozytna. 8 (1): 89–110. PMID 12138912.
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