"An NYRB Classics Original Shakespeare, Nietzsche once wrote, was Montaigne's best reader. It is a typically brilliant Nietzschean insight, capturing the intimate relationship between the ever-changing record of the mutable self constituted by Montaigne's Essays and Shakespeare's kaleidoscopic register of human character. For all that, how much Shakespeare actually read Montaigne remains a matter of uncertainty and debate to this day. That he read...