How wonderful that we can view Diane's letters and her will on this site. It is unfortunate that they are written in a French which is no longer in use. I am a French teacher, and I cannot decipher them. Thank you for sharing your illustrious ancestor.
I'm French teacher too and I tried to read the letters from Diane de Poitiers .
It's not easy to understand but you can , just think that the letter S is F .