The Cathedral of Our Lady is the principle church of Luxembourgs Old City. It is located on the same rock outcrop as the ducal palace and the Bock. The cathedral was erected in the 17th century; the towers were modified during the 20th. It is the site of Royal weddings, funerals and other major religious events for the Luxembourgian monarchy. Inside is a statue of the Comforter of the Afflicted which is venerated by many pilgrims, a crypt with a wide array of modern art, and a sarcophagus holding the remains of John the Blind, ruler of Luxembourg during the 14th century.