A conversation with Peter Sarris (University of Cambridge) about the emperor Justinian (527-565), on the 401st anniversary of the rediscovery of Prokopios' Secret History. We talk about Justinian's goals, accomplishments, and victims, all of which continue to spark debate and controversy, just as they did during his own lifetime. The conversation is based on Peter' new trade book Justinian: Emperor, Soldier, Saint (Basic Books 2023).