Sigmund Freud mit Söhnen Ernst und Martin

Freud with his sons Ernst and Martin (right) in their Austro-Hungarian army uniforms in 1916. All three of Freud’s sons fought for the Central Powers in World War I. A Habsburg loyalist, Freud believed the early optimistic predictions of victory offered by the Austrian and German governments. (ullstein bild via Getty Images)

ullstein bild via Getty Images