When Vladivoj died the next year, Jaromír and Oldřich returned to Bohemia and Jaromír was proclaimed duke by the Bohemian nobles. The Bohemian lands were occupied in turn by the Polish forces of Bolesław, who reinstated Boleslaus III as duke. After he ordered a massacre of the rival Vršovci clan, however, he lost the support of the Polish ruler and was finally deprived of power. Meanwhile, Jaromír had sought military backing from King Henry II. At Merseburg, he promised to hold Bohemia as a vassal of the king. This action definitively placed Bohemia within the jurisdiction of the Holy Roman Empire.
