Otto this time visited primarily Western Pomeranian burghs, had the temples of Gützkow and Wolgast torn down and on their sites erected the predecessors of today's "St Nikolai" and "St Petri" churches, respectively, before turning to Kamień Pomorski, Wolin and Szczecin. The nobility assembled to a congress in Usedom, where they accepted Christianity on June 10, 1128. Otto then was titled "apostolus gentis Pomeranorum", made a saint by pope Clement III in 1189, and was worshiped in Pomerania even after the Protestant Reformation. Holy Roman Emperor Lothair claimed the areas west of the Oder for his empire. Thus the terms of Otto's second mission were not negotiated with Boleslaw III of Poland, but with Lothar and Wartislaw. However Lothair terminated the mission in the fall of 1128, probably because he distrusted Otto's contacts with Boleslaw. Otto visited Gniezno on his way back to Bamberg. Adalbert of Pomerania, the later Pomeranian bishop, participated in Otto's mission as an interpreter and assistant. Fate of the pagan priesthood  The priests of the numerous gods worshipped before the conversion were one of the most powerful class in the early medieval society. Their reaction to the Christianization of Pomerania was ambiguous: In 1122, they saved missionary Bernhard's life by declaring him insane, otherwise he would have been killed in Wolin. On the other hand, Otto of Bamberg's mission was a far larger threat to the established pagan tradition, and eventually it succeeded in Christianization of the region. There are reports of unsuccessful assassination attempts made against Otto of Bamberg by the pagan priesthood. Following Otto's success, some of the pagan priests were crucified, while it is unknown what happened to the others. It has been speculated that they adapted to the new reality. On Otto of Bamberg's behalf, a diocese was founded with the see in Wollin ("Julin", "Jumne", "Vineta"), a major Slavic and Viking town in the Oder estituary. On October 14, 1140, Adalbert of Pomerania was made the first Bishop by Pope Innocent II. Otto however had died the year before. There was a rivalry between Otto's Diocese of Bamberg, the Diocese of Magdeburg and the Diocese of Gniezno for the incorporation of Pomerania.