Roman Empire
Central government

The Imperial cult of ancient Rome identified emperors and some members of their families with divinely sanctioned authority (auctoritas). The rite of apotheosis (also called consecratio) signified the deceased emperor's deification. The dominance of the emperor was based on the consolidation of powers from several republican offices. The emperor made himself the central religious authority as pontifex maximus, and centralized the right to declare war, ratify treaties, and negotiate with foreign leaders. While these functions were clearly defined during the Principate, the emperor's powers over time became less constitutional and more monarchical, culminating in the Dominate.

The emperor was the ultimate authority in policy- and decision-making, but in the early Principate, he was expected to be accessible and deal personally with official business and petitions. A bureaucracy formed around him only gradually. The Julio-Claudian emperors relied on an informal body of advisors that included not only senators and equestrians, but trusted slaves and freedmen. After Nero, the influence of the latter was regarded with suspicion, and the emperor's council (consilium) became subject to official appointment for greater transparency. Though the Senate took a lead in policy discussions until the end of the Antonine dynasty, equestrians played an increasingly important role in the consilium. The women of the emperor's family often intervened directly in his decisions.

Access to the emperor might be gained at the daily reception (salutatio), a development of the traditional homage a client paid to his patron; public banquets hosted at the palace; and religious ceremonies. The common people who lacked this access could manifest their approval or displeasure as a group at games. By the 4th century, the Christian emperors became remote figureheads who issued general rulings, no longer responding to individual petitions. Although the Senate could do little short of assassination and open rebellion to contravene the will of the emperor, it retained its symbolic political centrality. The Senate legitimated the emperor's rule, and the emperor employed senators as legates (legati): generals, diplomats, and administrators.

The practical source of an emperor's power and authority was the military. The legionaries were paid by the Imperial treasury, and swore an annual oath of loyalty to the emperor. Most emperors chose a successor, usually a close family member or adopted heir. The new emperor had to seek a swift acknowledgement of his status and authority to stabilize the political landscape. No emperor could hope to survive without the allegiance of the Praetorian Guard and the legions. To secure their loyalty, several emperors paid the donativum, a monetary reward. In theory, the Senate was entitled to choose the new emperor, but did so mindful of acclamation by the army or Praetorians.
detectable_content:number_placeholders[8], startend:end_checker, keywords:frequency