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Spanning one-ninth of the earth's circumference across three continents, the Roman Empire ruled a quarter of humanity through complex networks of political power, military domination and economic exchange. These extensive connections were sustained by premodern transportation and communication technologies that relied on energy generated by human and animal bodies, winds, and currents. Conventional maps that represent this world as it appears from space signally fail to capture the severe environmental constraints that governed the flows of people, goods and information. Cost, rather than distance, is the principal determinant of connectivity. For the first time, ORBIS allows us to express Roman communication costs in terms of both time and expense. By simulating movement along the principal routes of the Roman road network, the main navigable rivers, and hundreds of sea routes in the Mediterranean, Black Sea and coastal Atlantic, this interactive model reconstructs the duration and financial cost of travel in antiquity. Taking account of seasonal variation and accommodating a wide range of modes and means of transport, ORBIS reveals the true shape of the Roman world and provides a unique resource for our understanding of premodern history.

Abstract: What happens when states or empires face multiple and geographically dispersed assaults along their frontiers from non-state, tribal actors? It is plausible to argue that the result may be state decentralization, both military and administrative. In some cases, this may be a conscious strategy pursued by the central authorities, but in others, it may be the result of centrifugal tendencies pursued by disaffected local leaders. This article illustrates this argument by describing the end of the Roman empire, caused by multiple assaults of barbarian groups. The lesson is that in such an environment a centralized state that arrogates to itself all the functions of security provision may undermine its own safety.

The government that led Rome's rise to world power in the middle and late Republic was founded on aristocratic competition. What drew men to the struggle was the prospect of personal honor and political authority.[1] Entry into the highest stratum of Roman society came with victory at the polls: for most of the history of the Republic those who won a curule magistracy could expect enrollment in the senate at the next census, but even before that date they enjoyed a senator's prerogatives. They perhaps also earned a place among the nobilitas and passed this distinction on to their sons.[2] Furthermore, winning public office was inseparably bound up with the moral imperatives of aristocratic status. Virtus,gloria,dignitas, and a constellation of associated ideals represented the highest aspirations of aristocratic endeavor, and although in the abstract the qualities these words defined were capable of various manifestations, only rarely and awkwardly in fact could they be revealed apart from service to the state. Hence the vital importance of winning public office and thereby gaining the chance to display them: the moral superiority that their possession implied, quite as much as membership in the senate or noble birth, enabled individuals to