Author Philippa Gregory has said she now insists on a "clause" in her contract with film makers to stop them changing historic facts in her work.
"I could not tolerate script writers changing the history of the novels," she told the BBC.
"The temptation of film makers to treat historical fact and fiction as if they were one and the same thing... is something I oppose."
Gregory's book The Other Boleyn Girl was adapted for film in 2008.
Gregory told the BBC that script writers "of course have the right to adapt the fiction to a drama".
She added: "It's one of the interesting issues that emerges when writing a hybrid like historical fiction, when the history is on the record but the fiction (the material of the novel) is of course imagined."
The best-selling author added that this was a new clause for her contracts and that it "doesn't apply to works already in development, but I imagine I will try to apply it in all future contracts".
She was asked about the film adaptation during a talk at Edinburgh International Book Festival, saying that "having gone to all the trouble of getting it right in the novel" it was frustrating to have the content altered, The Times reported.
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