Appreciated. Before make edits we had Armand Jean du Plessis, Cardinal-Duc de Richelieu et de Fronsac:

“If one would give me six lines written by the hand of the most honest man, I would find something in them to have him hanged.”

More generally known as Cardinal Richelieu.

Having been wondering if it were he or Dumas who came up with that line, I found:

https://history.stackexchange.com/a/28484

but a quick perusal of de Motteville's bio suggests she had been exiled from court at Richelieu's behest, so she may not exactly be a disinterested observer, but was probably very aware of court politics in the years before her arrival.

For what it's worth, I haven't been able to find (Isaac de?) "Laffemas" via full-text search of any of the scans of her memoires I've turned up. (Two of them I searched for "innocent", a word seemingly rare in court memoirs, but no luck there either.) Gallica has a much longer scan (about 50% more pages) but it doesn't seem to have been OCR'ed, and I'm not going to manually check 630pp.

Wikiquote also notes dispute:

https://en.wikiquote.org/wiki/Cardinal_Richelieu