My book, a major expansion of my dissertation, incorporates much new research and analysis on tribunes of the plebs, including demographics, career paths, activity in Rome civic landscape, and patterns of interaction with magistrates, senate, and plebs. A key contribution is its comprehensive assemblage and analysis of source data on tribunes in a massive, detailed Chronology of Tribunes (170,000+ words). This Chronology includes microhistories of all known tribunes and 650+ actions attributed in our sources to anonymous (unnamed) tribunes. Peer reviewers agree that the collected data on anonymous tribune activity represent a significant advance in available resources essential for new work on the tribunes, the tribunate as an institution, and Republican political culture; it also lays the groundwork for a substantial reassessment of debated issues, such as the tribunate’s central role in Rome’s administrative functioning and popular participation in politics and legislation. The book concludes with an examination of Augustus’ appropriation in 23 BCE of tribunicia potestas—without holding the office of tribune—as a key component for his bundle of powers.