Рейнский союз
After the dissolution of the Holy Roman Empire in 1806, Dalberg together with other princes joined the Confederation of the Rhine. He formally resigned the office of Arch-Chancellor in a letter to Emperor Francis II, and was appointed prince-primate of the Confederation of the Rhine by Napoleon. At that point, the " of Frankfurt was included among his territories. Not long after, Dalberg appointed Napoleon's uncle, Cardinal Fesch, coadjutor in his archdiocese (an action for which he had no canonical rights).