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Boleslaus I the Cruel
Duke of Bohemia
Years: 915 - 972
Boleslaus I the Cruel, also called Boleslav I (c. 915 – 15 July, 967 or 972), is the ruler (kníže, literally "prince," but usually translated as "duke") of Bohemia from 935 to his death.
He is the son of Vratislaus I and the younger brother of his predecessor, Wenceslaus I.
