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. By 976, Henry II had returned to Bavaria. Whether Otto II released him from prison or he escaped is not known for certain. Upon his return, Henry openly rebelled against Otto II, claiming rulership over the Empire for himself. Henry II mobilized the Saxon nobility against Otto II. In particular, Henry II had strong connections to Margrave Gunther of Merseburg, Count Egbert the One-Eyed, and Dietrich I of Wettin, who were all displeased with Otto II's lack of adherence to Saxon tradition. In response to the rebellion, Otto II stripped Henry II of his duchy and had him excommunicated. Otto II then marched his army south to Bavaria and laid siege to Regensburg, Henry II's stronghold. Otto II's army eventually broke through the city's defenses, forcing Henry II to flee to Bohemia. With Henry II deposed, in July 976 Otto II issued far-reaching edicts on the reorganization of the southern German duchies. Otto II reduced the size of Duchy of Bavaria by almost a third. From the excised Bavarian territory, Otto II established the Duchy of Carinthia in southern Germany. By depriving Bavaria of the March of Verona, Otto II considerably reduced the influence of the Bavarian dukes in northern Italy and in general Imperial policy regarding Italy. Otto II gave the newly diminished Duchy of Bavaria to his relative Otto, the Duke of Swabia, and appointed Henry III, son of the former Bavarian Duke Berthold, as Duke of Carinthia. These appointments continued his policy of appointing individuals who had no political links to Otto the Great, including those who had even rebelled against him. With matters in southern Germany settled, Otto II turned his attention to defeating and capturing Henry II. After a failed first invasion into Bohemia, Otto II marched to Bohemia a second time in August 977. While in Bohemia, a revolt broke out in Bavaria. Henry I, Bishop of Augsburg, and the newly appointed Carinthian Duke Henry III joined Henry II in rebellion, forcing Otto II to