The portrait of Sebastian Piskorski was most likely created around 1707. It is one of many portraits of parish priests of distinguished service to the temple. It commemorates the priest responsible (on the part of the authorities of the Jagiellonian University) for the construction and decoration of the academic temple.
Józef Skrabski, "Portrait of Sebastian Piskorski", [in:] "The Sacred Lesser Poland Heritage", 2023, source: https://sdm.upjp2.edu.pl/en/works/portrait-of-sebastian-piskorski