The appointment of Otto as Duke of Swabia was taken by Henry II as an assault on his claim to the Imperial throne and a slight to his honor. He and his advisor, Bishop Abraham of Freising, conspired with the Duke of Poland Mieszko I and the Duke of Bohemia Boleslaus II against Otto II in 974. While the historical sources do not describe the goals of the conspirators, Henry II likely intended to restore his honor and to ensure his position as the second most influential man in the Empire. Upon hearing of the conspiracy, Poppo, the Bishop of Würzburg, demanded Henry II and his followers submit to Otto II or face excommunication. Otto the Great's efforts to consolidate the Church under Imperial control had made this type of action normal. Henry II and his followers complied and submitted to Otto II before armed conflict broke out. Otto II, however, severely punished the conspirators: Henry II was imprisoned at Ingelheim and Bishop Abraham at Corvey.