A chain hangs on the gate outside St. Michael's Cathedral.
St. John Chrysostom on St. Paul’s chains:
No glittering diadem so adorns the head as a chain borne for Christ. Were the choice offered me either of heaven or of this chain suffered for Christ, I would take the chain. If I might have stood with the angels above, near the throne of God, or have been bound with Paul, I should have preferred the dungeon. Had you rather been the angel loosing Peter or Peter in chains? I would rather have been Peter. The gift of chains is something greater than power to stop the sun, to move the world, or to command the devils.