Unfortunately, research on furnishings of the St. Martin's church carried out so far, due to lack of archival records on the constructors, does not even try to determine a circle of potential authors of the reredoses and its sculptural decor. The sculpture was made in the second half of the 18th century and it depicts St. Marcus, who was cousin to St. Barnabas. St. Marcus accompanied St. Paul and St. Barnabas in their missionary journeys. He was not Christ's disciple, and he wrote the Gospel on the basis of the teaching of St. Peter the Apostle. According to tradition he died a martyr's death as the bishop of Alexandria, circa 74.
Maria Działo, "Sculpture of St. Mark", [in:] "The Sacred Lesser Poland Heritage", 2024, source: https://sdm.upjp2.edu.pl/en/works/sculpture-of-st-mark