Boleslaus II the Pious (Czech: Boleslav II. Pobon Polish: Bolesaw II. Pobony; c. 927/928 7 February 999), a member of the Pemyslid dynasty, was Duke of Bohemia from 972 until his death.

The Slavniks/Slavníks or Slavnikids (Czech: Slavníkovci; German: Slawnikiden; Polish: Sławnikowice) was a dynasty in the Duchy of Bohemia during the 10th century. It is considered to be of White Croats origin. The center of the semi-independent principality was the gord of Libice located at the confluence of the rivers Cidlina and Elbe. The Slavníks competed with the Přemyslid dynasty for control over Bohemia and eventually succumbed to them.