Count Oppenheimer was an Imperial noble and admiral who served as chief of the military police under Kaiser Friedrich IV. During the Imperial Civil War of 797 UC, he sided with the Lippstadt Alliance; he later claimed he hadn't wished to participate, but was obliged to due to his blood relation to Wilhelm von Littenheim.

Following the war, Reinhard von Lohengramm was prepared to give Oppenheimer his previous position back; however, after Oppenheimer attempted to bribe him with a famous Erlemeier painting, Lohengramm had him arrested.