Slavnik's heir was his son Soběslav who rushed to consolidate the princedom's independence. For instance, he began to coin money in Libice, known among numismatists as the silver senars, in spite of the primacy of Prague. Prague was the capital of the Duchy of Bohemia, ruled by Boleslaus II, and the Diocese of Prague was founded there in 973. However, after Adalbert was appointed the head of the Diocese in 982, a conflict escalated between Boleslaus II of Bohemia and Poland's Duke Bolesław I Chrobry in 985, and in 989 Adalbert left the Diocese, only to return in 991 or 992 when a truce was signed. Although he managed to found the Břevnov Monastery, as he was from another principality's noble family, he did not have enough authority and support by Boleslaus II in the Diocese, and in late 994 offered his episcopal see to Strachkvas, Boleslaus II's brother, who nevertheless refused it. In 995 Adalbert again temporarily left for Rome.