Karl Theodor Anton Maria von Dalberg (8 February 1744 – 10 February 1817) was a Catholic German bishop and statesman. In various capacities, he served as Archbishop of Mainz, Prince of Regensburg, Arch-Chancellor of the Holy Roman Empire, Bishop of Constance and Worms, Prince-Primate of the Confederation of the Rhine and Grand Duke of Frankfurt. Dalberg was the last Archbishop-Elector of Mainz.
The Principality of Aschaffenburg (German: Fürstentum Aschaffenburg) was a principality of the Holy Roman Empire created in 1803 and, following the dissolution of the Empire in 1806, of the Confederation of the Rhine, which existed from 1806 to 1810. Its capital was Aschaffenburg.
With the secularization of the Archbishopric of Mainz in 1803, Karl Theodor Anton Maria von Dalberg was compensated by receiving the newly created principalities of Aschaffenburg and Regensburg and the County of Wetzlar. Along with the city of Aschaffenburg, the Principality of Aschaffenburg also consisted of Klingenberg, Lohr, Aufenau, Stadtprozelten, Orb, and Aura.