Old Heidelberg

Karl Heinrich is the heir to the throne of the small European principality of Rutania, but he's a lonely child, not allowed to play with other children and knowing little about life outside the castle. When he reaches maturity, he is sent to attend the University of Heidelberg, and finds fellowshi with classmates and a blossoming love with Katie Ruder, his only friend during childhood and the niece of an innkeeper. However, political turmoil in Rutania forces him to return. War is declared. Heinrich returns to Heidelberg one last time to bid a somber farewell to his beloved Katie.

• 
  John Emerson
• 
  Erich von Stroheim

• 
  Wallace Reid
  Prince Karl Heinrich
• 
  Dorothy Gish
  Katie Ruder
• 
  Karl Formes
  Dr. Juttner
• 
  Erich von Stroheim
  Lutz
• 
  Raymond Wells
  Karl Bilz
• 
  John McDermott
  Von Wendell
• 
  James Gibson
  Kellerman
• 
  Franklin Arbuckle
  Fritz Ruder - Katie's Father
• 
  Madge Hunt
  Frau Hans Ruder - Katie's Aunt
• 
  Erich von Ritzau
  Prince Rudolf (as Erik von Ritzau)
• 
  Kate Toncray
  Frau Fritz Ruder - Katie's Mother
• 
  Harold Goodwin
  Prince Karl - Age 12
• 
  Francis Carpenter
  Prince Karl - Age 5