History
The office of ''interrex'' was supposedly created following the death of Rome's first king Romulus, and thus its origin is obscured by legend. The Senate of the Roman Kingdom was at first unable to choose a new king. For the purpose of continuing the government of the city, the Senate, which then consisted of one hundred members, was divided into ten ''decuriae'' (groups of ten); and from each of these ''decuriae'' one senator was nominated as ''decurio''. Each of the ten ''decuriones'' in succession held the regal power and its badges for five days as ''interrex''; and if no king had been appointed at the expiration of fifty days, the rotation began anew. The period during which they exercised their power was called an interregnum, and on that occasion lasted for one year, after which Numa Pompilius was elected as the new king. After the death of each subsequent king, an ''interrex'' was appointed by the Senate. His function was to call a meeting of the ''Comitia Curiata'', which would elect a new king. Under the Republic, ''interreges'' were appointed to hold the ''comitia'' for the election of the consuls when the consuls, through civil commotion or other cause such as death, had been unable to do so during their year of office. Each ''interrex'' held the office for only five days, as under the kings. During the brief ''interregnum'', they cumulated most the original power of the king, or the power of the two consuls in the first years of the Republic. The ''comitia'' were, as a general rule, not held by the first ''interrex'', who was originally the '' curio maximus'', but more usually by the second or third; in one instance we read of an eleventh, and in another of a fourteenth ''interrex''. The ''comitia'' to elect the first consuls were held by Spurius Lucretius Tricipitinus as ''interrex'' was also called ''praefectus urbis''. The ''interreges'' under the Republic, at least from 482 BC, were elected from ex-consuls by the Senate, and were not confined to the ''decem primi'' or ten chief senators as under the kings. Plebeians, however, were not admissible to this office; and consequently when the Senate included plebeians, the patrician senators met together without the plebeian members to elect an ''interrex''. For this reason, as well as on account of the influence which the ''interrex'' exerted in the election of the magistrates, we find that the tribunes of the plebs were strongly opposed to the appointment of an ''interrex''. The interrex had ''jurisdictio''. It is possible that ''interreges'' were the only magistrates exempted from the veto power of a tribune - which would be exceptional, since even dictators were usually subject to the veto. ''Interreges'' continued to be appointed occasionally until the time of theList of Roman ''interreges'' (509 - 52 BC)
Unless otherwise indicated, the names and dates of the ''interreges'' are taken from Thomas Broughton's ''The Magistrates of the Roman Republic''.References
Sources
{{Ancient Rome topics Ancient Roman titles Roman Kingdom Regents