 At the end of the 18th century, the interior had been restructured in the style of Classicism (or Neoclassicism) by .Karl Theodor von Dahlberg, Archbishop of Mainz in 1803, retained the territory of Aschaffenburg — turned into the newly created Principality of Aschaffenburg — and was awarded other territories in compensation for territories west of the Rhine, including Mainz, which were annexed by France.From 1810-3, Aschaffenburg was part of the Grand Duchy of Frankfurt.