Eva Braun, who married Nazi leader Adolf Hitler hours before the pair committed suicide in 1945, was of Jewish descent, according to DNA analysis conducted for a TV documentary.
The Dead Famous DNA film - to be screened on Channel 4 on Wednesday - will claim that tests on hair samples said to have come from a monogrammed hairbrush used by Braun, show she was possibly of Jewish ancestry.
A team of scientists examined the hair and found a particular sequence within the DNA, which had been passed down the maternal line - the haplogroup N1b1 - which the channel said was "strongly associated" with Ashkenazi Jews, who make up around 80% of the global Jewish population.
Many Ashkenazi Jews in Germany converted to Catholicism in the 19th century.
Presenter Mark Evans sourced the hair samples, which were originally found by American army intelligence officer Paul Bae at Hitler's mountain retreat.
He said: "This is a thought-provoking outcome - I never dreamt that I would find such a potentially extraordinary and profound result."
The only way to prove beyond doubt that the samples were from Braun would be to take a DNA swab from one of her two surviving female descendants, but both refused.
Adolf Hitler's food taster has confirmed that the dictator was a vegetarian, in her first ever interview.
Margot Woelk, 95, told The Times (£) she was forced to taste the Nazi leader's food from 1941 until November 1944 when he abandoned the Wolf’s Lair - a military headquarters - as the Russians closed in.
She said: "They told me, we have to taste the food that Hitler is served. Of course I was afraid. If it had been poisoned I would not be here today. We were forced to eat it, we had no choice.”
"It was all vegetarian, the most delicious fresh things, from asparagus to peppers and peas, served with rice, and salads. It was all arranged on one plate, just as it was served to him," she added.
Ms Woelk said: "It was quite delicious, the best vegetables and cut fruit. There was no meat and I do not remember any fish. Drinks were delivered somewhere else, the SS took them, we did not have to try drinks."