Chapter 3 explores how the models of the healer and head of state converged around the figure of the princeps. Although each proved useful in validating the Principate, their distinctive Republican histories invested them with divergent imperial trajectories. Because Cicero had already integrated the figure of the healer into Republican discourse, Augustan writers could soon locate the princeps in this role as well. The regal resonance of the caput, in contrast, made it unavailable as a descriptor of the “first citizen.” It is therefore absent in the works of Vergil, Horace, and Propertius. Yet for a society steeped in organic comparisons and confronted with constitutional change, the utility of the metaphor was obvious. Livy responded to this quandary in his first pentad, which depicts three stages in the life cycle of the Roman body politic: a regal polity topped by a caput, a Republic structured around the Fable of the Belly, and a fusion of these two forms under Camillus. Livy’s narrative thereby helped make the head of state metaphor available for contemporary usage. As Augustus’ rule came to an end, Ovid finally began identifying him as the caput orbis.

In the Ab Urbe Condita, Livy reports that in 363 BC a dictator was appointed to revive the ancient ritual of the Capitoline nail in the midst of a plague (Livy 7.3.1–9). While recounting this historic episode, Livy provides a detailed description of an inscribed law marking this ritual that was located in the temple of Jupiter Optimus Maximus on the Capitoline.

Livy’s History is very interested in the way that societies are maintained by belief in a host of shared fictions. The Roman citizenship is Livy’s prime example of this process, as Rome keeps recreating the model of citizenship as more and more new people come into the Roman sphere. The fictive power of the citizenship allows it to be redescribed from generation to generation. The citizenship is not a matter of shared blood or of a shared place of birth; it is a corporate fiction that can in theory accommodate anyone as a member.