Nicollò Machiavelli is a household name among educated adult; most people who have taken an international-relations or political-theory course have read, at least in part, sections of The Prince or of the Discourse on Livy.His friend and contemporary, Francesco Guicciardini (1483-1530) is far less well known. Indeed, I would wager that even a majority of international-relations scholars have never heard of Guicciardini (at the very least, a...