Input (grade 5): The Basilica of St. Peter is one of four Papal Basilicas or Major Basilicas of Rome the others being the Basilica of St. John Lateran, Santa Maria Maggiore and St. Paul outside the Walls.
Output (grade 5): The basilicas are St. Peter's Basilica, St. John Lateran, Santa Maria Maggiore and St. Paul outside the Walls.