The validity of the Frankenberger thesis has been questioned in historical research since its inception. Consequently, it is rejected by most researchers. Both Frankenberger's paternity and his status as a Jew are questioned. As early as 1956,
Franz Jetzinger, author of
Hitler’s Youth, pointed out that "the name Frankenberger [...] does not sound Jewish at all" and that it must therefore "first be proven" that Frankenberger—even if he was actually the father of Alois Hitler—actually was a Jew. Jetzinger also emphasized that "any evidence" was missing for alleged alimony payments. His conclusion is therefore: "Frank's report is at most sufficient to suspect Jewish descent, he does not guarantee a certainty." In the 1960s, the archives of the city of Graz came to the conclusion that the alleged Frankenberger was probably identical to Leopold Frankenreiter: On the one hand, not a single Frankenberger could be found in the lists of residents of the city of Graz for the period in question and, on the other hand, this name corresponded to that name attributed by Hitler's nephew
William Patrick Hitler to Hitler's grandmother's employer. However, Frankenreiter was not of Jewish descent, but had been baptized Catholic with his entire family. However, even after this correction, the name Frankenberger remained the one to be found much more frequently in the literature.
Joachim Fest judged that "the lack of verifiable evidence [...] makes the thesis appear extremely questionable". Although Frank had little reason to knowingly falsely ascribe Hitler Jewish ancestors, "the thesis can hardly stand up to serious discussion". The "actual meaning" of the thesis lies "less in its objective validity". "Far more decisive and psychologically significant" was "that Hitler had to see his origins cast into doubt by Frank's results. [...] Adolf Hitler did not know who his grandfather was."
Maximilian I issued a decree in 1496 which expelled all Jews from
Styria (including Graz), and they were not permitted to officially reside there again until the 1860s, decades after Alois had been born. Notable historians who dismiss the thesis are
Ian Kershaw,
Robert Payne,
Walter Görlitz,
Anton Joachimsthaler,
Christian Graf von Krockow,
John Toland,
Brigitte Hamann Apart from serious historical research, the "revelation" of Hitler's "Jewish descent" has been taken up again and again by publications with a popular scientific,
conspiracy theory or sensationalist impact. It is characteristic of this literature, which is almost unmanageable in its breadth, that it attempts to present source material that has been known for decades, in particular Frank's rumours, as new knowledge and in doing so fails to mention the continuous and almost unanimously skeptical and negative reception by the leading Hitler biographers. In May 2019, American psychologist
Leonard Sax wrote an article titled "Aus den Gemeinden von Burgenland: Revisiting the question of Adolf Hitler's paternal grandfather" which attempts to provide evidence for the antisemitic conspiracy theory that Hitler had Jewish ancestry and that was the basis for his antisemitism. Sax points out that many Jews lived in places without official sanction and demonstrated the existence of a settled Jewish community in Graz before the law formally permitted their residence, saying that "Contemporary historians have largely dismissed Frank's claim, primarily on the grounds that there were purportedly no Jews living in Graz in 1836, when Hitler's father Alois Schicklgruber was conceived. This consensus can be traced to a single historian, Nikolaus von Preradovich," a Nazi sympathizer, "who claimed that 'not a single Jew' (kein einziger Jude) was living in Graz prior to 1856. No independent scholarship has confirmed Preradovich's conjecture. In this paper, evidence is presented that there was in fact 'a small, now settled community' (eine kleine, nun angesiedelte Gemeinde)—of Jews living in Graz before 1850." And that "The hypothesis that Hitler's paternal grandfather was Jewish, as claimed by Hans Frank, may fit the facts better than the alternative hypothesis that Hitler's paternal grandfather was
Johann Georg Hiedler or
Johann Nepomuk Hiedler." However, historian
Richard J. Evans has questioned Sax's findings. Evans wrote, "even if there were Jews living in Graz in the 1830s, at the time when Adolf Hitler's father Alois was born, this does not prove anything at all about the identity of Hitler's paternal grandfather." And, that, "There is no contemporary evidence that Hitler's mother was ever in Graz, or that there was a Jewish family called Frankenberger living there. There was a family in Graz called Frankenreiter but it was not Jewish. No correspondence between Hitler's father or paternal grandmother has ever been found. Nor is there any evidence for Frank's claim that Hitler's half-nephew knew about it and was blackmailing Hitler, as Frank claimed." Also, Evans noted that Sax is not a historian, but a psychiatrist, and that Sax seems to be motivated by attempting to prove Hitler had Jewish ancestry as a way to explain his antisemitism. ==See also==