When I wrote about Mary Wollstonecraft, I found that here she was, in the late 18th century, going to work for the 'Analytical Review.' What was the 'Analytical Review?' It was a magazine that dealt with politics and literature.
I had forgotten until I looked up old notes that I sold the film rights of my first book, a life of Mary Wollstonecraft: there was a lunch, a contract, a small sum of money, then nothing.
Biographies are, in their nature, far more difficult to make into films than novels, because novels come with plots constructed and dialogue written, whereas I don't invent dialogue for my subjects or plot their lives for them.