The inscription on the Lateran's facade calls it mother and head of all the churches of the city and of the world, and the whole Church keeps the anniversary of its dedication as a feast on 9 November. A cathedra, Benedict XVI explained, is the fixed seat of a bishop in the mother church of his diocese and the sign of his authority to teach. For a pilgrim this changes how Rome is read: St. Peter's shows where the Apostle is buried and where the Pope usually celebrates, while the Lateran shows what the Pope is, a bishop with a diocese, whose universal ministry comes from holding Peter's see. A newly elected Pope formally takes possession of his chair there: Leo XIV did so on 25 May 2025, and in his homily pointed to the inscription on the cathedral's facade.
Rome · YOUR QUESTION, ANSWERED
Why is St. John Lateran, not St. Peter's, the Pope's cathedral?
Because the Pope is the Bishop of Rome, and Rome's cathedral, the church that holds its bishop's chair, has been the Lateran basilica since the fourth century. Its dedication to Christ the Savior is traditionally dated to 324; St. John the Baptist and St. John the Evangelist were added as patrons later. The popes lived in the adjoining Lateran Palace for about a thousand years and moved to the Vatican only after the Avignon period. St. Peter's is the shrine over the Apostle's tomb, not the cathedral.
Related questions, answered
Is St. Peter's Basilica a cathedral?
No. St. Peter's is a papal basilica built over the tomb of the Apostle. The cathedral of the Diocese of Rome is the Archbasilica of St. John Lateran.
Why is it called St. John Lateran?
Lateran is the name of the Roman family whose property once stood on the site. The basilica is dedicated first to Christ the Savior, with St. John the Baptist and St. John the Evangelist as co-patrons added in later centuries.
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