Cathedral
A cathedral is the principal church of a diocese, containing the bishop's official chair (the "cathedra"), which gives the building its name.
The Bishop's Seat
The cathedra itself — a physical chair — is a visible sign of the bishop's teaching authority over the diocese, similar to how a professor once taught "from the chair."
One Per Diocese
Every diocese has exactly one cathedral, even if it also contains many other large and historic churches, including basilicas.
Frequently Asked Questions
Is every large or old church a cathedral?
No — size and age don't make a church a cathedral; only the presence of the bishop's official chair and its status as the diocese's principal church does.
Can a cathedral also be a basilica?
Yes — some churches hold both titles at once, being both the bishop's official seat and separately honored with the basilica title.