The inscription below has this line:
MORTUO XV KAL. OCT. A.S. MDCCCLVII
I'm not sure what
A.S. stand for. The source of the image states that the person died the 17th of September. The inscription says instead that he died the 15th of October. What is
KAL. to do with it? Is some sort of calendar correction? The year is correct.
A.S., is this anno sancti? I was surprised not to find
A.D., as usual in these inscriptions.