The Kampian Chapel is one of the best monuments of Renaissance architecture in Lviv, part of the ensemble of the Latin Cathedral. It is located on Cathedral Square, the entrance to it is from the Latin Cathedral.

It was built near the northern wall of the Latin Cathedral in 1619 as the Kampian ancestral tomb at the expense of Martin Kampian, burgomaster of Lvov, doctor of medicine, a wealthy merchant. Martin and his father Pavel Kampian (a former fugitive serf who achieved wealth and the position of Lvov patrician) are depicted on the busts in the interior. The chapel was built by Pavel the Roman and V. Kapinos, the sculptor was probably J. Pfister, perhaps A. Bemer or G. Horst (Sharp). In 1760 the ceiling of the chapel was painted by the painter Stanislav Stroinsky.
The Campian Chapel has come down to us in its original form, without significant changes. It is square in plan, covered with a vault, the entrance is from the church. In the lower part, the massive plinth is decorated with faceted squares, on which Tuscan pilasters rest, the fields between which are filled with reliefs. The middle part of the chapel is decorated with exquisite cartouches. The façade is completed by a Doric frieze with carved rosettes and lion heads, a cornice and an attic with three oval medallions. The decor of the facade is one of the examples of Lviv late Renaissance plastics. The interior of the chapel is lined with multi-colored marble, the decor is also designed in the Renaissance style.