 In 1838, the castle was expanded by adding two side wings.When Julius' son, Prince Moritz de Montléart, acquired the property after considerable legal battles, he gave it to his wife Wilhelmine ("née" von Arnold) and named the castle "Wilhelminenberg".Upon their deaths in 1887 and 1895, respectively, both were interred in a small mausoleum which was built in the "neo-gothic" style close to the castle.