According to historian Brigitte Hamann, a boy born to the Queen of Hungary in the castle at Budapest would have raised the possibility of his someday becoming its king, separating Hungary from the Austrian empire, and there was universal relief at the Viennese court that Valerie was a girl.
Following the publication of The Hidden Hitler by the historian and University of Bremen professor Lothar Machtan, Hamann investigated claims about Hitler's homosexuality and appears in the 2004 HBO documentary film, Hidden Fuhrer: Debating the Enigma of Hitler's Sexuality, by the American documentarians Fenton Bailey and Randy Barbato.
Brigitte Hamann: The Reluctant Empress: A Biography of Empress Elisabeth of Austria (Knopf: 1986) (ISBN 0-394-53717-3) (410pp.).
Scholars such as Ian Kershaw and Brigitte Hamann dismiss the Frankenberger hypothesis (which had only Frank's speculation to support it) as baseless.
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