The altar was built in 1893 by the Cracovian sculptor - Kazimierz Wokulski. Formally it corresponds to the high altar, which had been built only 6 years before, and with the chancel of St. Nicholas altar on the opposite side.
Agata Felczyńska , "St. John Cantius left altar in chancel area", [in:] "The Sacred Lesser Poland Heritage", 2025, source: https://sdm.upjp2.edu.pl/en/works/st-john-cantius-left-altar-in-chancel-area