"One of the most important writers and thinkers of the Renaissance, Michel de Montaigne (1533-92) helped invent a literary genre that seemed more modern than anything that had come before. But did he do it, as he suggests in his Essays, by retreating to his chateau, turning his back on the world, and stoically detaching himself from his violent times? In this definitive biography, Philippe Desan, one of the world's leading authorities on Montaigne,...