The introductory chapter details what is gained by using the concept of social role when studying power relations in Late Antiquity and how it ties in well with ancient ideas about why people act in the way they do. It shows how Late Antique thought and practice conceptualized social hierarchies in moral terms and argues that precisely the expectation that social and moral hierarchies coincide injects the dynamism in social interactions that this book chronicles. It also underscores that society was conceived of as held together by justice and shows how this was intertwined with hierarchical conceptions of society and the cosmos.