The Fourth Gate, also called the Bishop’s Gate, is located in the western part of Alba Carolina, on the middle line of the wall connecting the two bastions, St. Michael and the Trinitarians. It has one pedestrian entrance, spacious and is decorated in baroque style. Besides, it is included in the list of Baroque art monuments in Transylvania. 18th century. The entrance to the tunnel of the gate is monumental, guarded to the left and to the right by two profiled pillars, continue on the height of the caps with ionic volutes, plus a beautiful vegetal decoration. In the lower part of the pillars we find a stylobate whose purpose is to support an atlantic element of architectural stability of the gate.
Above the pillars there is the antabland, a lightly shaped archite, an underexposed frieze and a cornice in the center of which we re-see this common element of the fortification gates, the emblem of the Austrian Empire, the crowned bicephal eagle, the claws of power, the scepter and the sword. Under the eagle, on the medial bolt of the bow of the gate, there is a mask carved in stone, the embodiment of Anger. Above the bow arch we encounter bas-reliefs with ancient military equipment. To the left and to the right of the gang there were guard rooms of the garrison, and upstairs were living quarters.