page_title: Boleslaus II, Duke of Bohemia
section_title: Unification of the Bohemian lands
hierarchical_section_title: Boleslaus II, Duke of Bohemia / Life and reign / Unification of the Bohemian lands
caption_attribution_description: Čeština: Mapa rozsahu českého státu v 10. století za vlády Boleslava I. a Boleslava II. English: Map showing Czech state in the 10th century under Boleslav I. and Boleslav II.
context_page_description: Boleslaus II the Pious, a member of the Přemyslid dynasty, was Duke of Bohemia from 972 until his death.
context_section_description: Boleslaus's reign is most notable for the foundation of the Diocese of Prague in 973, earning him the epithet "The Pious" by the medieval chronicler Cosmas of Prague. Nevertheless, the Bohemian diocese was placed at that time within the jurisdiction of the Archbishop of Mainz and Emperor Otto II enforced the appointment of the Saxon monk Thietmar (Dětmar) as first bishop. 
  Meanwhile, the struggle with the rivalling Slavník dynasty flared up again from 981 onwards, when Prince Soběslav striving for independence began to forge alliances with the Polish and Saxon rulers. Upon Bishop Dětmar's death in 982, Soběslav's brother Adalbert (later known as Saint Adalbert of Prague) was appointed his successor until he abandoned his primacy to lead a mission to the Old Prussians in 994. On 28 September 995, Boleslaus' forces and the confederate Vršovci clan stormed Libice Castle in southern Bohemia and massacred the members of the Slavník dynasty that were found there. Boleslaus's brutal triumph ensured the unity of Bohemia under a single ruler.
caption: Bohemian lands during the reign of Boleslaus I and Boleslaus II
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