Adalbert participated in the conversion of the pagan inhabitants of
Pomerania (
Lutici and
Slavic Pomeranians) during the missionary expeditions of Otto of Bamberg in 1124 and 1128, when he aided Otto as his assistant and interpreter. Adalbert is assumed to be of Polish origin. The territory was put under the jurisdiction of the
archbishopric of Magdeburg by Holy Roman emperor
Otto I, King of Germany. In 1133 the Magdeburg archbishop Saint Norbert received verification by the pope of his jurisdiction over a number of dioceses, including those in Pomerania. However, bishop
Otto of Bamberg had actually baptized the Pomeranians and therefore thought to add it to his southern Bamberg archdiocese and in order to avoid conflicts, pope
Innocent II exempted the Pomeranian bishopric(s). Otto did not succeed during his lifetime in founding a diocese, due to a conflict between the archbishops of
Magdeburg and
Gniezno about ecclesiastical hegemony in the area.
Pope Innocent II founded the diocese by a
papal bull of 14 October 1140, and made the church of St. Adalbert at (
Julin (Wollin/Wolin) on
Wollin/Wolin island the see of the diocese. After the death of Duke Ratibor I, Adalbert received the same support from his two nephews, Dukes Bogislaw I and Kasimir I. His last act was the confirmation of the richly gifted
Grobe Monastery near Usedom, founded by Ratibor I, on 8 June 1159. When Wolin was destroyed by Danes in the late 12th century, the diocese was moved to
Cammin (also Kammin, now
Kamień Pomorski ); this bishopric became known as the
Roman Catholic Diocese of Kammin. ==References==