In 980 Adalbert finished his studies at Magdeburg school and returned to Prague where he became a priest. In 981 his father, Prince Slavnik, and both his mentors died. In 982, still not yet thirty years old, Adalbert became the
Bishop of Prague. However, he strongly resented the participation of formally Christian inhabitants in the
slave trade. Although Adalbert descended from a rich family and could afford comfort and luxury, he lived poorly of his own free will. He was noted for charity, austerity, and zealous service to the Church. His duty was difficult even in baptized Bohemia, as the pagan creed was deeply embedded in the peoples' minds. Adalbert complained of polygamy and idolatry, which still were not unusual among the Czechs.
In 989 he resigned from his bishop's cloth and left Prague. He went to Rome and lived as a hermit in St. Alexis Benedictine monastery.
Four years later, in 993,
Pope John XV sent him back to Bohemia. Adalbert became the Bishop again. That time he founded a
monastery in Břevnov, near Prague, the first one for men in the Czech lands. However, he continued to meet with the same kind of opposition to his ministry from the nobility that he had faced earlier. Also, according to Cosmas' chronicle, high clerical office was a burden to Adalbert, and in 994 he offered it to
Strachkvas who was Přemyslid and Duke Boleslav's brother. Strachkvas, nevertheless, refused.
In 995 Slavniks' former rivalry with the
Přemyslids resulted in the storming of Libice and a cruel murder of four (or five) of Adalbert's brothers. All this was done by the will of
Boleslav II of Bohemia, and the key executioners were his confederates from a powerful clan of
Vršovci. Thus the Zličan princedom became part of the Přemyslids' estate.
Adalbert damned the Vrśovci in church and predicted that they would be severely persecuted. After the tragedy he could not stay in Bohemia and escaped from Prague, despite the Pope's call for him to return to his episcopal see. Strachkvas was eventually appointed to be his successor. However, when he was going to assume the Bishop office in Prague, he suddenly died during the ceremony itself. Circumstances of his death are still unclear.
As for Adalbert, he went to
Hungary and baptized
Géza of Hungary and his son
Stephen in the city of
Esztergom. Then he went to Poland where he was cordially welcomed by Bolesław I the Brave. After the short visit Adalbert went to Prussia with a Christian mission.