Built at the time of the Counter-Reformation, this church is rich in baroque embellishments. This was the university church, dedicated to the Jesuit saints Ignatius of Loyola and Franciscus Xaverius. The high-baroque decorations -- galleries, columns, and the trompe l'oeil painting on the ceiling, which gives the illusion of a dome -- were added from 1703 to 1705. The embellishments were the work of a Jesuit lay brother, Andrea Pozzo, on the orders of Emperor Leopold I. Look for Pozzo's painting of Mary behind the main altar. Choir and orchestra services (mostly classical) are celebrated on Sunday and holy days at 10am.