The 34-meter-high, octagonal bell tower was built in 1588 by order of Archduke Charles II. Inside is the third largest bell in Styria, the "Liesl" cast by Martin "Mert" Hilger in Graz in 1587. It has a diameter of 197 cm and weighs 4633 kg. The bell rings at 101, 7 and 12 a.m. and 7 p.m. every day. It is tuned to the main beat gis0. As a reason for this custom, it is reported that the bell was cast from 101 recovered Turkish cannonballs. This tradition probably does not correspond to reality, because the "Liesl", like most bells, is made of bronze, but cannonballs are not. In any case, material from the armory was made available for the bell casting. In 1809, the intervention of the citizens of Graz prevented the bell tower from being blown up by the French. There is a dungeon under the bell tower, known as the "bass violin".