What needs to be included in a book for it to be based on a true story?

I stumbled across a woman from the 1700s and I can’t find any books or movies on her so I thought I’d write it about her but all I can find is her name, the year she died, why she died (she murdered a child) and her reason for doing so and where she lived but I can’t find anything like how her husband died or how... show more I stumbled across a woman from the 1700s and I can’t find any books or movies on her so I thought I’d write it about her but all I can find is her name, the year she died, why she died (she murdered a child) and her reason for doing so and where she lived but I can’t find anything like how her husband died or how old she was ect
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