They always seem to claim to have done a lot of research, don't they? Carolly Erickson, the one who came up with Robespierre the "Green Ghoul" calls herself a historian. But to be honest, I wouldn't be surprised if she had got the idea on a royalist internet forum, which, as far as I can tell, seems to be the place the myth of Robespierre's insanity has the most currency