A plaque with inscription is part of Joachim Lubomirski's tombstone. For some time it was housed separately, but it was re-placed and maintained along with the entire tombstone in 2015. It has a Latin inscription referring to life and with a date of death of the deceased.
Agata Felczyńska, "Fragment of Joachim Lubomirski's tombstone ", [in:] "The Sacred Lesser Poland Heritage", 2025, source: https://sdm.upjp2.edu.pl/en/works/fragment-of-joachim-lubomirskis-tombstone-1