Rome’s was a politics of all five senses. It was a city of noise, of refuse and bodies in the street, of massive crowds, of massive construction, and a size and opulence not equaled in Europe again for more than a millennium. In maps and inscriptions, Rome was the center of the world. How did Rome become this way? This chapter looks to intercity relations to resolve this puzzle. The Roman Empire was in effect a network of cities in the core–periphery mode – the ultimate “consumer city” supplied by vast hinterlands. Lacking the perfect local environment, Rome imported the commodities – and people – needed to construct an alpha city. The city grew as haphazardly and violently as the Empire itself. The greater the resources of the Empire, the larger the foundation for Rome’s growth. This hit crisis point in the Late Republic, as an increasingly dispossessed agrarian peasantry migrated en-masse to cities alongside inhabitants from across the world. In short, the context for Rome’s growth was a hitherto unparalleled age of globalization in the first and second centuries CE.

Ancient Greece, especially Athens, provides the best documented early example of mass democracy. With the democratic reforms of the fifth century, populism – the direct mobilization of the masses – becomes an effective path to power. This chapter looks at several examples from fifth- and fourth-century Athens, which demonstrate the use of demagoguery as an efficient, if much derided, alternative to patronage-based politics. Ancient Rome provides a somewhat different context. As a republic, Rome gave the masses a more limited and indirect role in politics. Typically, politics was a purely elite affair. Yet for those elites who found the normal insider path blocked to them, direct appeals to the masses could prove effective. However, given the limited formal role for the plebs in Roman politics, this direct mobilization could often lead to violence.