Historical accuracy

Philippa Gregory
Historical fiction seems to be about a careful weaving of facts that can be verified and the stories you tell around them. This is most evident in Philippa Gregory‘s books about the royals in Britain, a series of books I think I own entirely in hardcover (demonstrating my respect for them).
In an interview posted on AbeBooks, she says ” In historical fiction, you have to imagine conversations that may have happened, based on the historical facts.”
I wonder if that also extends to deaths of historical figures where the cause of death goes undocumented (as far as I can tell through my research)?
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