Over the holiday I took a lead from Fr Robin’s recommendation and read the Abbé Henri Huvelin’s Some Spiritual Guides of the Seventeenth Century; it was so captivating that I then cleaned it up (editorially — no need of censorship) and posted my fresh edition to the Internet Archive.
You can download it from here, and you can find Abbé Huvelin’s graduation picture at the École Normale from the Archive as well. Some Spiritual Guides narrates the backstories of its subjects, including the startling rumours about theb Abbé de Rancé and his encounter with Madame de Montbazon’s severed head.