Boleslaus II
Boleslaus II took over the rule of the Duchy of Bohemia as "kníže" (a title that may be translated either as duke or prince) on his father's death in 972. Like his father, Boleslaus II initially quarrelled with the Ottonian kings of Germany. In 974, he and Duke Mieszko I of Poland supported the rebellious Duke Henry II of Bavaria in his civil war against the rule of Emperor Otto II. In 976, Henry was defeated and fled to Boleslaus' court at Prague Castle, after which Otto's forces campaigned in the Bohemian lands. Finally in 978, Boleslaus solemnly pledged allegiance to the emperor at the Easter festivities in Quedlinburg.