The last Duke of Zähringen died in 1218. This dynasty ruled for 150 years in northwest Switzerland, southwest Germany and Burgundy. They were the influential monarchs in the Holy Roman Empire. They built numerous and castles and founded cities (a.o. Bern, Bräunlingen, Burgdorf, Freiburg (i.Br.), Freiburg i.Ü., Murten, Neuenburg am Rhein, Rheinfelden, Thun). The exhibition deals with art, legends and historical reality, castles, cities, pedigrees and other subjects in a castle also built by the Zähringen.