Byzantine style keys in bronze from the 12th century. The large key is from St. Elizabeth's church in Marburg; the small key from the ruins of Memleben Abbey. Chromolithograph from Hefner-Alteneck's 鈥楥ostumes; Artworks and Appliances from the Middle Ages to the 17th Century;' Frankfurt; 1879. Illustration by Dr. Jakob Heinrich von Hefner-Alteneck; lithographed by Joh. Klipphahn; and published by Heinrich Keller. Hefner-Alteneck (1811 - 1903) was a German museum curator; archaeologist; art historian; illustrator and etcher.