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Lewis Stone as Rudolf Rassendyll / King Rudolf |
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Alice Terry as Princess Flavia |
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Robert Edeson as Colonel Sapt |
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Stuart Holmes as Grand Duke 'Black' Michael |
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Ramon Novarro as Rupert of Hentzau |
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Barbara La Marr as Antoinette de Mauban |
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Malcolm McGregor as Capt. Fritz von Tarlenheim |
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Edward Connelly as Marshal von Strakencz |
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Lois Lee as Countess Helga |
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John George as Assassin |
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Snitz Edwards as Josef |
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Fairfax Burger as Bersonin |
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S.E. Jennings as De Gautet |
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Ted Billings as Train Passenger Eating Banana (uncredited) |
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Eric Mayne as Rudolf's Brother Lord Burlesdon (uncredited) |
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Lon Poff as Archbishop (uncredited) |
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Frederick Vogeding as Detchard (uncredited) |
| Writing | Slavko Vorkapich | Writer |
| Directing | Rex Ingram | Director |
| Writing | Anthony Hope | Novel |
| Writing | Mary O'Hara | Writer |
| Camera | John F. Seitz | Director of Photography |
| Production | Rex Ingram | Producer |
| Editing | Grant Whytock | Editor |
| Art | Amos Myers | Art Direction |
