The pope, as part of his duties, receives the office of Bishop of Rome, which was first held by the apostle Peter. Bishop of Rome is also often used as an alternate title for the pope. (See also Holy See.) Found on https://www.encyclo.co.uk/local/23051
1) Pope 
The pope, as part of his duties, receives the office of Bishop of Rome, which was first held by the apostle Peter. Bishop of Rome is also often used as an alternate title for the pope. (See also Holy See.)