The Grand Dukes full title was Grand Duke of Saxe-Weimar-Eisenach , Landgrave in Thuringia , Margrave of MeiÃ en , Princely Count of Henneberg , Lord of Blankenhayn , Neustadt and Tautenburg . The full grand ducal style was Grand Duke of Saxe-Weimar-Eisenach , Landgrave in Thuringia , Margrave of Meissen , Princely Count of Henneberg , Lord of Blankenhayn , Neustadt and Tautenburg .