Mayerling
Rudolf, the only heir to Emperor Franz Josef of Austria-Hungary, is trapped in a loveless marriage to a Belgian princess. As he seeks to flee his stifling environment, he meets the beautiful Maria, and the two enter into a scandalous affair. Despite the interference of the Emperor, the couple refuse to give each other up.
Starring Charles Boyer, Danielle Darrieux, Jean Dax, Yolande Laffon, Suzy Prim, Gina Manès, Marthe Régnier, Odette Talazac, Nane Germon, Assia Granatouroff
It's a drama and history movie, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.