In 1917, during the First World War, Czernin was Foreign Minister to Emperor Karl I of Austria. After French Intelligence officer, Indiana Jones brought in Princes Xavier and Sixtus of Bourbon-Parma to Vienna, Austria to sign a secret treaty with France and Britain. After the Emperor wavered before signing the treaty, Czernin drafted a document that would have allowed the Austrians to deny knowledge of the treaty in the event that the German Kaiser learned of it.
- The Young Indiana Jones Chronicles – "Austria, March 1917" → Adventures in the Secret Service
- The Secret Peace
- The Secret Treaty