The title's date of establishment is unknown, but it first appears in inscriptions of the Late Republic, from around 80 BC onwards. Previously, the official name of the Roman state, as evidenced on coins, was simply ROMA. The abbreviation last appears on coins of Constantine the Great (ruled 312–337 AD), the first Roman emperor to support Christianity.[citation needed]
This signature continued in use under the Roman Empire. The emperors were considered the de jure representatives of the people even though the senātūs consulta, or decrees of the Senate, were made at the de facto pleasure of the emperor.[citation needed]
Populus Rōmānus in Roman literature is a phrase meaning the government of the People. When the Romans named governments of foreign states, they used populus in the singular or plural, such as populī Prīscōrum Latīnōrum, "the governments of the Old Latins". Rōmānus is the established adjective used to distinguish the Romans, as in cīvis Rōmānus, "Roman citizen".[citation needed]
The Roman people appear very often in law and history in such phrases as dignitās, maiestās, auctoritās, lībertās populī Rōmānī, the "dignity, majesty, authority, freedom of the Roman people". They were a populus līber, "a free people". There was an exercitus, imperium, iudicia, honorēs, consulēs, voluntās of this same populus: "the army, rule, judgments, offices, consuls and will of the Roman people". They appear in early Latin as Popolus and Poplus, so the habit of thinking of themselves as free and sovereign was quite ingrained.[citation needed]
The Romans believed that all authority came from the people. It could be said that similar language seen in more modern political and social revolutions directly comes from this usage. People in this sense meant the whole government. The latter, however, was essentially divided into the aristocratic Senate, whose will was executed by the consuls and praetors, and the comitia centuriāta, "committee of the centuries", whose will came to be safeguarded by the Tribunes.[citation needed]
One of the ways the emperor Commodus (180–192) paid for his donatives and mass entertainments was to tax the senatorial order, and on many inscriptions, the traditional order is provocatively reversed (Populus Senatusque…).