A conversation with Olivier Hekster (Radboud University Nijmegen) about the position of Roman emperor, from the beginning to the sixth century. We talk a little bit about titles and mostly about the expectations that subjects had of their emperors and how the latter navigated these demands and tried, or failed, to play their roles properly. The conversation is based on Olivier's recent book Caesar Rules: The Emperor in the Changing Roman World (c. 50 BC - AD 565) (Cambridge University Press, 2023).