This paper explores the normative implications of Aristotle's concept of politikē and demonstrates its relevance to contemporary debates on legitimate political authority. Section one of the paper provides historical and interpretative background on Aristotle's conception of politikē. The second section examines the central normative role that the common good plays in Aristotle's account of politikē and claims that its capacity to play this role points in the direction of a less exclusionary politics than is suggested by Book 1 of the (...) Politics. Finally, in the third section, with reference to work by Andres Rosler and David Estlund, I consider what Aristotle's account can tell us about contemporary debates on the relationship between political authority, legitimacy and expertise. (shrink)