The bishop of Rome was also known by the title pope.
Explanation:
The pope is considered as the supreme authority of all catholic churches.
The pope is greatly responsible for the duty that has to be performed b the catholic churches like sanctifying, governing and teaching and assigning the duty under the priest of the respective diocese.
The office of the popes is called as the papacy. The popes can choose their name when they attain the posting of the pope. They were called as his holiness.
