The title's date of establishment is unknown, but it first appears in inscriptions of the Late Republic, from c. 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.
The two legal entities mentioned, Sen?tus and the Populus R?m?nus, are sovereign when combined. However, where populus is sovereign alone, Sen?tus is not. Under the Roman Kingdom, neither entity was sovereign. The phrase, therefore, can be dated to no earlier than the foundation of the Republic.
This signature continued in use under the Roman Empire. The emperors were considered the de jure representatives of the people even though the sen?t?s consulta, or decrees of the Senate, were made at the de facto pleasure of the emperor.
Populus R?m?nus in Roman literature is a phrase meaning the government of the People. When the Romans named governments of other countries, they used populus in the singular or plural, such as popul? Pr?sc?rum Lat?n?rum, "the governments of the Old Latins". R?m?nus is the established adjective used to distinguish the Romans, as in c?vis R?m?nus, "Roman citizen".
The Roman people appear very often in law and history in such phrases as dignit?s, maiest?s, auctorit?s, l?bert?s popul? R?m?n?, the "dignity, majesty, authority, freedom of the Roman people". They were a populus l?ber, "a free people". There was an exercitus, imperium, iudicia, honor?s, consul?s, volunt?s 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.
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 centuri?ta, "committee of the centuries", whose will came to be safeguarded by the Tribunes.
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...).
Beginning in 1184, the Commune of Rome struck coins in the name of the SENATVS P Q R. From 1414 until 1517, the Roman Senate struck coins with a shield inscribed SPQR.
SPQx is sometimes used as an assertion of municipal pride and civic rights. The Italian town of Reggio Emilia, for instance, has SPQR in its coat of arms, standing for "Senatus Populusque Regiensis". There have been confirmed usages and reports of the deployment of the "SPQx" template in;
Alkmaar, Netherlands, SPQA on the facade of the Waag building, now cheese museum.
Some members of white supremacist groups use the acronym SPQR on flags, on their person (such as tattoos) and other forms of identification. The movement's enthusiasm for other symbols of republican Rome, such as the axe and bundled rods known as fasces, is documented, as well as their interest in some aspects of republican and imperial Rome. That use was discussed on Stormfront's bulletin boards and was noticed at white supremacist demonstrations. White supremacists tend to associate "SPQR" with the militaristic ethos of the Roman legions. There is in fact no evidence that the initialism appeared regularly on Roman military insignia and equipment, but it was heavily used by Mussolini's fascist regime.
The Italians have long used a different and humorous expansion of this acronym, "Sono Pazzi Questi Romani" (literally: "They're crazy, these Romans"). In the Asterix and Obelix comics, Obelix often uses the French translation of this phrase, "Ils sont fous ces Romains", and in the Italian editions, the original phrase is used.
In the early twentieth century, the letters "SPQR" could sometimes be seen displayed on London market traders' stalls, meaning "Small Profits, Quick Returns".
S.P.Q.R. Records was an American popular music record label, a subsidiary of Legrand Records, which flourished in the 1960s and included Gary U.S. Bonds among its artists. The label was founded by Frank Guida, who is believed to have adopted the name in allusion to his Italian origins.
S.P.Q.R. is the fourth song on the critically acclaimed experimental rock album Deceit (1981) by This Heat. The song talks about atomic destruction and human morals using symbols of Rome.