Question: The Fate of the House of Habsburg, is a 1928 German silent drama film, it s based on the Mayerling incident, the series of events leading to the apparent murder–suicide of Rudolf, Crown Prince of Austria, and his lover, Baroness Mary Vetsera, in which year?
Sentence (from "The Fate of the House of Habsburg"): It is based on the Mayerling incident of 1889.
Relevant evidence: Yes