Offering the first complete translation into modern English of Aquinas' unfinished commentary on Aristotle's Politics, this translation follows the definitive Leonine text of Aquinas and reproduces in English those passages of William of Moerbeke's exacting yet elliptical translation of the Politics from which Aquinas worked. Bekker numbers have been added to passages from the Politics for easy reference. Students of the history of political thought will welcome this study of a great classic, a commentary by a student of Aristotle who is also a great political theorist in his own right.