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Imperium is a Latin word which, in a broad sense, translates roughly as 'power to command'. In ancient Rome, different kinds of power or authority were distinguished by different terms. Imperium referred to the sovereignty of the state over the individual. It is not to be confused with auctoritas or potestas, different and generally inferior types of power in the Roman Republic and Empire. Primarily used to refer to the power that is wielded, in greater or lesser degree, by an individual to whom it is delegated, the term could also be used with a geographical connotation, designating the territorial limits of that imperium. Individuals given such power were referred to as curule magistrates or promagistrates. These included the curule aedile, the praetor, the censor, the consul, the magister equitum, and the dictator.
Personal characteristic 
In ancient Rome, imperium could be used as a term indicating a characteristic of people, the wealth held in items, or the measure of formal power they had. This qualification could be used in a rather loose context (for example, poets used it, not necessarily writing about state officials). However, in Roman society it was also a more formal concept of legal authority. A man with imperium ("imperator") had, in principle, absolute authority to apply the law within the scope of his magistracy, or promagistracy, but could be vetoed, or overruled, by a magistrate, or promagistrate, having imperium maius (a higher degree of imperium) or, as most republican magistracies were multiple (though not quite collegial since each could act on his own), by the equal power of his colleague (e.g., the other consul). Some modern scholars, such as A.H.M. Jones have defined it as, "the power vested by the state in a person to do what he considers to be in the best interests of the state".
Imperium can be distinguished from regnum, or royal power, which was inherited. Imperium was originally a military concept, the power of the imperator (general in the army) to command. The word derives from the Latin verb, imperare (to command). The title imperator was applied to the emperor, who was the commander of the armed forces. In fact, the Latin word, imperator, gives us the English word "emperor".
Imperium was indicated in two prominent ways. A curule magistrate, or promagistrate, carried an ivory baton surmounted by an eagle as his personal symbol of office (compare the field marshal's baton). Any such magistrate was also escorted by lictor bearing the fasces (traditional symbols of imperium and authority); when outside the pomerium, axes were added to the fasces to indicate an imperial magistrate's power to enact capital punishment outside Rome (the axes were removed within the pomerium). The number of lictors in attendance upon a magistrate was an overt indication of the degree of imperium. When in the field, a curule magistrate possessing an imperium greater or equal to praetor imperium wore a sash ritually knotted on the front of his cuirass. Further, any man executing imperium within his sphere of influence was entitled to the curule chair.
- Curule Aedile (aedilis curulis) – 2 lictors
- Since a plebeian aedile (aedilis plebis) did not own imperium, he was not escorted by lictors.
- Magister equitum (the dictator's deputy) – 6 lictors
- Praetor – 6 lictors (2 lictors within the pomerium)
- Consul – 12 lictors each
- Dictator – 24 lictors outside the Pomerium and 12 inside; starting from the dictatorate of Lucius Sulla the latter rule was ignored.
- Because the dictator could enact capital punishment within Rome as well as without, his lictors did not remove the axes from their fasces within the pomerium.
As can be seen, dictatorial imperium was superior to consular, consular to praetorian, and praetorian to aedilician; there is some historical dispute as to whether or not praetorian imperium was superior to "equine-magisterial" imperium. A promagistrate, or a man executing a curule office without actually holding that office, also possessed imperium in the same degree as the actual incumbents (i.e., proconsular imperium being more or less equal to consular imperium, propraetorian imperium to praetorian) and was attended by an equal number of lictors.
Certain extraordinary commissions, such as Pompey's famous command against the pirates, were invested with imperium maius, meaning they outranked all other owners of imperium (in Pompey's case, even the consuls) within their sphere of command (his being "ultimate on the seas, and within 50 miles inland"). Imperium maius later became a hallmark of the Roman emperor.
Another technical use of the term in Roman law was for the power to extend the law, beyond its mere interpretation, extending imperium from formal legislators under the ever-republican constitution: popular assemblies, senate, magistrates, emperor and their delegates to the jurisprudence of jurisconsults.
Divine and earthly imperium 
In some monotheistic religions such as Christianity (the Catholic Church where the official language, Latin, used terms as Imperium Dei/Domini) the Divine is held to have a superior imperium, as ultimate King of Kings, above all earthly powers. Whenever a society accepts this Divine will to be expressed on earth, as by a religious authority, this can lead to theocratic legitimation. However, the Catholic Church and most other Christian groups acknowledge the authority of secular governments. If however a secular ruler controls the religious hierarchy, he can use it to legitimate his own authority.
Thus absolute, universal power was vested under early Islam in the original Caliphate (before it became the political toy of worldly powers 'behind the throne' and was even politically discarded by essentially secular princes), and later again claimed by Mahdis.
While the Byzantine Eastern Roman Emperors retained full Roman imperium and made the episcopate subservient, in the feudal West a long rivalry would oppose the claims to supremacy within post-Roman Christianity between sacerdotium (the 'priesthood', i.e. the clergy ministering the word and will of God) in the person of the Pope and the secular imperium of the revived Western Roman Emperor since Charlemagne. Both would refer to the heritage of Roman law by their titular link with the very city Rome: the Pope, Bishop of Rome, versus the Holy Roman Emperor (even though his seat of power was north of the Alps).
The Donatio Constantini, by which the Papacy had allegedly been granted the territorial Patrimonium Petri in Central Italy, became a weapon against the Emperor. The first pope who used it in an official act and relied upon it, Leo IX, cites the "Donatio" in a letter of 1054 to Michael Cærularius, Patriarch of Constantinople, to show that the Holy See possessed both an earthly and a heavenly imperium, the royal priesthood. Thenceforth the "Donatio" acquires more importance and is more frequently used as evidence in the ecclesiastical and political conflicts between the papacy and the secular power: Anselm of Lucca and Cardinal Deusdedit inserted it in their collections of canons; Gratian excluded it from his Decretum, but it was soon added to it as Palea; the ecclesiastical writers in defence of the papacy during the conflicts of the early part of the 12th century quoted it as authoritative.
In one bitter episode, pope Gregory IX who had several times mediated between the Lombards and the Holy Roman Emperor Frederick II reasserted his right to arbitrate between the contending parties. In the numerous manifestos of the pope and the emperor the antagonism of Church and State becomes daily more evident: the pope claimed for himself the imperium animarum 'command of the souls' (i.e. voicing Gods will to the faithful) and the principatus rerum et corporum in universo mundo 'princedom over all things and bodies in the whole world', while the emperor wished to restore the imperium mundi, imperium (as under Roman Law) over the (now Christian) world — Rome was again to be the capital of the world and Frederick was to become the real emperor of the Romans, so he energetically protested against the world-empire of the pope. The emperor's successes, especially his victory over the Lombards at the battle of Cortenuova (1237), only embittered the opposition between Church and State. The pope again excommunicated the "self-confessed heretic", the "blasphemous beast of the Apocalypse" (20 March 1239) who now attempted to conquer the rest of Italy, i.e. the papal states, et cetera.
The chief minister of Henry VIII, the Archbishop of Canterbury Thomas Cranmer suggested removal of the Roman Catholic papacy's imperium in imperio (Latin equivalent of state in the state) by requesting that Parliament pass the Act in Restraint of Appeals (1533) specifying that England was an empire and that The Crown was imperial, and a year later the Act of Supremacy proclaiming the Imperial Crown Protector and Supreme Head of the Church of England.
In Orthodox Russia too, when Peter I the Great assumed the Byzantine imperial titles Imperator and Autokrator, instead of the 'merely' royal Tsar, the idea in founding the Russian Holy Synod was to put an end to the old Imperium in imperio of the free Church, by substituting the synod for the all too independent Patriarch of Moscow, who had become almost a rival of the Tsars — Peter meant to unite all authority in himself, over Church as well as State: through his Ober-Procurator and synod, the Emperor ruled his Church as absolutely as his army and navy through their respective ministries; he appointed its members (mostly bishops) just as his generals; and the Russian Government continued his policy until the end of the empire in 1917.
Even in 19th century North America, when by the decree of the President of the United States, Brigham Young, the Mormon hierarch and head of The Church of Jesus Christ of Latter-day Saints, was appointed first Governor of the Utah Territory on 28 September 1851, this was called (politically, not in law) establishing a semi-theocratic (theodemocratic) form of government there (until the Utah War) as an imperium in imperio, within the limits of the republic.
See also 
- Constitution of the Roman Republic
- Cursus honorum
- Monopoly on violence
- Imperial cult
- Translatio imperii
- Encyclopædia Britannica, Empire. University of Chicago, 1962. Vol. 8, p. 402