The sculpture of St. Gregory the Great, along with the whole high altar, was created in the Cracovian sculpture workshop of Władysław Druciak in 1914. His works are described as an example of historicism in sacred sculpture of the early 20th century. St. Gregory I, called Gregory the Great, was a Bishop of Rome in 590-604. He is known as a liturgical reformer and a reformer of church music, regarded as one of the Doctors of the Church, next to: St. Augustine (d. in 430), St. Ambrose (d. in 397) and St. Jerome d. in 420).
Maria Działo, "Sculpture of St. Gregory the Great", [in:] "The Sacred Lesser Poland Heritage", 2023, source: https://sdm.upjp2.edu.pl/en/works/sculpture-of-st-gregory-the-great