In ancient Rome, imperium was a form of authority held by a citizen to control a military or governmental entity. It is distinct from auctoritas and potestas, different and generally inferior types of power in the Roman Republic and Roman Empire. One's imperium could be over a specific Roman legion, or it could be over a Roman province. Individuals given such power were referred to as curule Roman magistrate or . These included the curule aedile, the praetor, the Roman consul, the magister equitum, and the Roman dictator. In a general sense, imperium was the scope of someone's power, and could include anything, such as public office, commerce, political influence, or wealth.
In ancient Rome, imperium could be used as a term indicating a characteristic of people, their wealth in property, 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 Right. A man with imperium (an imperator) had, in principle, absolute authority to apply the law within the scope of his Roman magistrate or promagistrate. He could be or overruled either by a magistrate or promagistrate who was a colleague with equal power (e.g., a fellow Roman consul), by one whose imperium outranked his – that is, one of imperium maius (greater imperium), or by a tribune of the plebs.
Some modern such as A. H. M. Jones have defined imperium 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 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;
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 Piracy, were invested with imperium maius, meaning they outranked all other holders of imperium of the same type or rank (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 .
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 between Church and State became more evident: the Pope claimed for himself the imperium animarum ("command of the souls", i.e. voicing God's will to the faithful) and the principatus rerum et corporum in universo mundo ("primacy 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 authority of the Pope. The emperor's successes, especially his victory over the Lombards at the battle of Cortenuova (1237), only aggravated tensions 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).
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