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Frankenberger thesis
Claim of Adolf Hitler's Jewish descent
Frankenberger thesis
The Frankenberger thesis, also Frankenreiter thesis, is a discredited thesis that claims Adolf Hitler's paternal grandfather was Jewish. Referring to the parentage of Hitler's father Alois Hitler—who was born in 1837 as the illegitimate son of the housemaid Maria Anna Schicklgruber, which has not been clarified with absolute certainty—the Frankenberger thesis asserts that the unknown father of Hitler's father was a Jewish merchant from Graz named Leopold Frankenberger (or Frankenreiter) or his son and that Adolf Hitler was therefore a "quarter Jew" in the sense of the Nuremberg Race Laws later imposed by his own regime. Nazi politician Hans Frank brought the thesis into prominence through his 1946 memoir Im Angesicht des Galgens (In the Face of the Gallows), written while awaiting execution. A 2025 DNA test on Hitler's blood upheld his established paternal ancestry, firmly refuting the Frankenberger thesis.
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