The oldest church in Vienna, Ruprechtskirche has stood here since 740, although much that you see now, such as the aisle, is from the 11th century. Beautiful new stained-glass windows, the work of Lydia Roppolt, were installed in 1993. Much of the masonry from a Roman shrine on this spot is believed to have been used in the present church. The tower and nave are Romanesque; the rest of the church is Gothic. St. Rupert is the patron saint of the Danube's salt merchants.