In 1082 William arrested his half-brother Odo, Bishop of Bayeux and Earl of Kent. The reasons are uncertain but Odo was trying to raise an army to march on Rome. His plan was to become the next Pope. William put him on trial on the Isle of Wight. In addition to other crimes was that of trying to raise an army among William's soldiers. As William pointed out, they were needed for the defense of England. Odo protested that not even a king could judge him. As a bishop only the Pope could. William replied that he wasn't seizing a bishop, he was seizing his earl who he left in charge during his absence. Odo was imprisoned in Normandy for the rest of his life.