For centuries, Roman emperors ruled a vast empire. Yet, at least officially, the emperor did not exist. No one knew exactly what titles he possessed, how he could be portrayed, what exactly he had to do, or how the succession was organised. Everyone knew, however, that the emperor held ultimate power over the empire. There were also expectations about what he should do and be, although these varied throughout the empire and also evolved over time. How did these expectations develop and change? To what degree could an emperor deviate from prevailing norms? And what role did major developments in Roman society – such as the rise of Christianity or the choice of Constantinople as the new capital – play in the ways in which emperors could exercise their rule? This ambitious and engaging book describes the surprising stability of the Roman Empire over more than six centuries of history.

‘Hekster's magisterial survey of Roman emperorship puts the subject on a new footing. Drawing on a wide range of literary, documentary, and visual evidence, it provides a rich and three-dimensional account of emperors in action and in the imagination. It will be of interest not only to Roman historians, but to all students of premodern rulership.'

Carlos Noreña - Associate Professor of Ancient History and Mediterranean Archaeology, University of California, Berkeley

‘The emperor was the single most unifying concept in the political imagination of a population of incredible cultural, ethnic and linguistic plurality. Furthermore, communicating the centrality of the emperor to this audience required being attentive to an historical landscape that changed dramatically over centuries. Hekster's new book approaches this important issue with intelligence and circumspection, noting the overdue need for a return to traditional political history, while engaging with the fruitful models of cultural and literary history. As a result, Caesar Rules is a sensitive study that will be of interest to historians, classicists and students of political science for many years to come.'

Shane Bjornlie - Professor of History, Claremont McKenna College