There are about 350 grave monuments of different sizes from the first till the 4th century. They come in different style, simple barrel vaulted rooms or two-storied houses with ornamentation, and many seem to contain frescoes or mosaics. I had seen some of these at an earlier visit and this time wanted to see more of the public buildings and climb to the castle. As a result you see little of the necropolis, let alone of the mosaics and frescoes. But here are some images.
These particular pictures show a church that stood in the necropolis, founded in the 4th century on an antique foundation. In a mosaic (I did not see it) the panther and the lamb represent the kingdom of peace.