The Jesuits came to Jarosław in 1573 and soon established a college which became a leading place of theological, educational and scientific study in Poland during the Reformation, and possessed one of the richest libraries in the country. Built from 1580-94, the Collegiate Church - formerly the Jesuit Church of St. John - is today the oldest former Jesuit church in Poland, and oldest place of worship in Jarosław.

After the dissolution of the Jesuit order in 1773 it was turned into a military barracks, its collections were moved to Lviv and many assets were sold. Following a fire, the church was reconstructed and reconsecrated as Corpus Christi Church in 1802. Among the most valuable treasures of the Renaissance church are the magnificent gold monstrance inlaid with precious jewels, and the image of Our Lady of the Snows on the main altar, the prototype of which is the miraculous image of Salus Populi Romani from the Basilica of Saint Mary Major in Rome. Also notice the entry doors with bronze reliefs of famous scenes from the history of Jarosław and Poland.