Ladislaus von Gielniów was a 15th-century Polish priest belonging to the Order of Friars Minor. Born in Gielniów around 1440, he pursued studies in Warsaw and Kraków before joining the Franciscan convent in 1464. Throughout his religious life, he held several significant positions, including serving as a doorkeeper and being elected as provincial of his order on multiple occasions. He was recognized for his missionary work, his preaching, and his deep commitment to penance and devotion to the Passion of Christ.