It is a small one-naved building partially dug into the ground located in the very centre of both the modern and the antique city, It was discovered during excavations after the Second World War. The church was first mentioned in the 16th century and was constructed at the place of a former Roman religious building. It is today a monument of culture known for its mural paintings from the 14th, 15th, 17th and 19th century depicting biblical scenes.