Who is the Jewish barber in the film, The Great Dictator?

The Jewish barber is an amnesiac due to a head injury sustained during the First World War. He helped save Captain Scultz, but he ended up having to spend the next 20 years in a hospital. Although he remembered his life as a barber, the barber remembered nothing else.

One day, he escapes from the hospital and reopens the barber shop. He unwittingly angers the soldiers, because he doesn't understand what is going on in the world now. The barber finds love with Hannah, but he and Schultz are sent to a concentration camp after plotting to overthrow Hynkel. When they escape, he is mistaken for Hynkel and becomes the kind and generous ruler of Tomania.