My history professor recently told us that Michel de Montaigne—who I had never heard of before—had many of Descartes's ideas before Descartes did and that most of Descartes's arguments were not very original but only rehashes of Montaigne's and others' work. She also claimed that Descartes wrote his Discourse only as an angry retort to some of Montaigne's ideas.
I'm not sure about most of this and am wondering if anyone can shed a bit of light on her claims. (Did Descartes "rip off" Montaigne? Did Montaigne's ideas have more historical significance? Did Descartes write the Discourse (or any other works) solely/mostly as an angry response to Montaigne?) Thanks for your help!