Original: During the Napoleonic Wars , the earl 's art collection was inherited by the Wittelsbach family and moved to Munich , prompting the Prussian government -- who had annexed the Düsseldorf region after Napoleon had surrendered -- to change it into a Royal Arts Academy in Düsseldorf , in 1819 .
Simplified: So the government of Prussia , who annexed the region of Düsseldorf after Napoleon surrendered , to open a new Royal Arts Academy in Düsseldorf .