William guaranteed that the monastery would be free from control by him, his successors or any other temporal power, and it was placed under the direct authority of the Pope in Rome, who accepted Cluny's charter. This was very important for the later history of the abbey, because it meant that no local bishop, who himself might have been against Cluny's Benedictine reform movement within the church, had the authority to stop Cluny from carrying out its work, since Cluny reported to the Pope alone.