Roman emperors governed a sprawling empire, from Britain to Syria—but how did they maintain control over such vast lands? Did they rely on spies to monitor their enemies and ensure loyalty? Enter the frumentarii, a mysterious group of soldiers originally tasked with grain supply. History reveals they evolved into agents of espionage, assassination, and taxation, serving emperors like Hadrian and Severus. This episode uncovers their shadowy roles—and why their power crumbled under Diocletian.