Franciscus Illenfeld is the author of the St. Urban Bell (cast it in 1557) which was installed in the St. Urban Tower in Košice, today Slovakia. Its weight was 7 tones. In 1966 the St. Urban Bell was destroyed by fire. It was renovated and located in the front of the tower. In 1996 a copy of the St. Urban Bell was cast in a mould and installed in the tower.
He is also the author of the St. John Bell that is exhibited at Zvonárska Street in Košice. The bell was founded in 1558.