A conversation with Jonathan Shea (Dumbarton Oaks) about Byzantine lead seals, of which we have some 70,000, and about the work and careers of Byzantine civilian bureaucrats. Seals are the hidden treasury of research on Byzantium: so small and yet, in large numbers, they allow us to do so much, and they bring us closer to the individuals who used them. The conversation is based on his recent book Politics and Government in Byzantium: The Rise and Fall of the Bureaucrats (Bloomsbury 2020).