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Promagistrate

Ancient Roman office

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By allowing veteran commanders to stay in the field rather than being rotated out for someone who may not have had much experience in the theatre, the practice helped increase the chances of victory. Whether a commander, however, would be kept was largely decided politically and often motivated by commanders' ambitions. However, the effect of prorogation was to allow commanders to retain their positions as long as political support existed, weakening the republican check of the annual magistracy (and the rotation that implied) over commanders' activities.

Sometimes men who held no elected public office – that is, private citizens (privati) – were given imperium and prorogued, as justified by perceived military emergencies. This was most exemplified by Scipio Africanus and Pompey: the latter held a series of promagisterial commands before ever holding a magistracy or even joining the senate. With the expansion of the quaestiones perpetuae (permanent courts) in the late republic, it became normal for the provincial governors not to be one of the annual praetors: instead, an urban magistrate would be assigned a province after serving his urban term and prorogued.

The titles "proconsul" and "propraetor" are not used by Livy or literary sources of the republican era. Those Romans did not view a promagistracy as a formal office in the republic. For example, one was not made a "proconsul" but rather assigned pro consule (in place of a consul); this instead specified the means by or status with which one took a task (Latin: provincia) rather than a permanent office associated with that task. While during the middle republic it was common for praetors to be prorogued pro praetore and consuls pro consule, after the Sullan era essentially all promagistrates were pro consule, regardless of previous urban magistracy.

A provincia was originally a task (e.g., war with Carthage) assigned to someone, sometimes with geographic boundaries; when such territories were formally annexed, the fixed geographical entity became a "province" in modern terms, but in the early and middle Republic, the "task" was most often a military command within a defined theatre of operations with unclear geographic boundaries.

Prorogation did not create a new commander or even class of general. It merely allowed a magistrate to continue performing duties beyond the expiration of the magistracy. While Livy implies that prorogation extended a magistrate's imperium, this is contradicted in that imperium was not time-limited. Cicero, for example, possessed imperium even after his governorship of Cilicia expired.

Because imperium did not expire, prorogation was simply an extension or reassignment of a commander's possession of a provincia, something feasible by senatorial decree. Previously, a provincia was coterminous with a magistrate's term: i.e. a magistrate was assigned some provincia but the task necessarily expired when he rotated out. Prorogation had the effect of severing this connection. While normally someone in the theatre or province was prorogued, one could also be prorogued by assigning a someone still possessing imperium to new provincia (as was the case with two imperatores during the Catilinarian conspiracy).

While modern scholars often suppose that prorogation was intended originally to ensure that an experienced commander with hands-on knowledge of the local situation could conclude a successful campaign, in practice the extension of command was subject to "unsteady ad-hoc politics". And "unusual political influence" was required for prorogations of longer than one year.

A Roman governor had the right, and was normally expected, to remain in his province until his successor arrived, even when he had not been prorogued. According to the lex Cornelia de maiestate, passed following Sulla's dictatorship, a governor was then required to give up his province within 30 days. A prorogued magistrate could not exercise his imperium within Rome.

The nature of promagisterial imperium is also complicated by its relation to the celebrating of a triumph as awarded by the Senate. Before a commander could enter the city limits (pomerium) for his triumph, he had to lay aside arms formally and ritually, that is, he had to re-enter society as a civilian. There are several early instances, however, of a commander celebrating a triumph during his two- or three-year term; it is possible that the triumph was held at the completion of his assignment and before he returned to the field with prorogued imperium.

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