The City Prison was a detention facility located in a large city on the planet 892-IV.
It was used by the natives of the planet to lock their slaves and thieves as potential gladiators for the popular television series Name the Winner, broadcast by Empire TV live from the City Arena. The complex was guarded by several policemen.
In 2268, an away team from the USS Enterprise including Captain James T. Kirk, Spock, and Doctor McCoy was held prisoners in this facility. (TOS: "Bread and Circuses")