Boleslaus I, Duke of Bohemia

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Boleslaus I
Boleslaus I the Cruel, fresco in the Znojmo Rotunda
Duke of Bohemia
Reign	September 935 – 15 July 967/972
Predecessor	Wenceslaus I
Successor	Boleslaus II
Born	915
Died	972 (aged 57)
Spouse	Biagota
Issue	Doubravka of Bohemia Boleslaus II, Duke of Bohemia Strachkvas Mlada
Dynasty	Přemyslid
Father	Vratislaus I, Duke of Bohemia
Mother	Drahomíra

Boleslaus I (Czech: Boleslav I. Ukrutný; 915–972), a member of the Přemyslid dynasty, was ruler (kníže, "prince") of the Duchy of Bohemia from 935 until his death in 972. He is notorious for the murder of his elder brother Wenceslaus, through which he became duke.

Despite his complicity in this fratricide, Boleslaus is generally respected by Czech historians as an energetic ruler who significantly strengthened the Bohemian state and expanded its territory.^[1] His accomplishments include significant economic development due to an expansion in trade, the introduction of silver mining and the minting of the first local coinage, the Prague denarius.