This is the site where, in the early 15th century, the firebrand Czech Protestant theologian Jan Hus raised the ire of the Catholic hierarchy with sermons critical of the establishment. He was burned at the stake as a heretic in 1415 at Konstanz in present-day Germany and became a martyr for the Czech Protestant and later nationalist cause. A memorial to Hus dominates the center of Old Town Square. The chapel was completed in 1394 and reconstructed in the early 1950s. In the main hall you can still see the original stone floors and the pulpit from where Hus preached; it's now used as a ceremonial hall for Czech national events.