There's a list of the 4 papal these churches, which in addition to St. Peter's include St. John Lateran
[DOC] [TLE] St. Peter's Basilica - Wikipedia [PAR] The Papal Basilica of St. Peter in the Vatican or simply St. Peter's Basilica (Latin: 
Basilica Sancti ... St. Peter's is one of the four churches in the world that hold the 
rank of Major Basilica, ... of the Pope as Bishop of Rome is in the Archbasilica of 
St. John Lateran.