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SPQR is an initialism of a phrase in Latin: Senātus Populusque Rōmānus ("The Roman Senate and People", or more freely as "The Senate and People of Rome"; Classical Latin: [sɛˈnaː.tʊs pɔpʊˈlʊs.kᶣɛ roːˈmaː.nʊs]), referring to the government of the ancient Roman Republic, and used as an official emblem of the modern-day comune (municipality) of Rome. It appears on Roman currency, at the end of documents made public by inscription in stone or metal, in dedications of monuments and public works, and was emblazoned on the vexilloids of the Roman legions.
SPQR: Senātus Populusque Rōmānus. In Latin, Senātus is a nominative singular noun meaning "Senate". Populusque is compounded from the nominative noun Populus, "the People", and -que, an enclitic particle meaning "and" which connects the two nominative nouns. The last word, Rōmānus ("Roman") is an adjective modifying the whole of Senātus Populusque: the "Roman Senate and People", taken as a whole.
Thus, the phrase is translated literally as "The Roman Senate and People", or more freely as "The Senate and People of Rome".
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 AD 312–337), the first Christian Roman emperor.
The two legal entities mentioned, Senātus and the Populus Rōmānus, are sovereign when combined. However, where populus is sovereign alone, Senātus 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 representatives of the people even though the senātūs consulta, or decrees of the Senate, were made at the pleasure of the emperor.
Populus Rōmānus 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 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".
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.
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.
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...).
Today SPQR is still the municipal symbol of the city of Rome.
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.
- Amsterdam, Netherlands, SPQA at one of the major theatres and some of the bridges
- Antwerp, Belgium, SPQA on the Antwerp City Hall
- Basel, Switzerland, SPQB on the Webern-Brunnen in Steinenvorstadt
- Benevento, Italy, SPQB on manhole covers
- Bremen, Germany, SPQB in the Bremen City Hall
- Bruges, Belgium, SPQB on its coat of arms
- Brussels, Belgium, SPQB found repeatedly on the Palais de Justice, and over the main stage of La Monnaie
- Catania, Italy, SPQC can be found on manhole covers
- Dublin, Ireland, SPQH on the City Hall, built in 1769
- Florence, Italy, SPQF
- Franeker, Netherlands, SPQF, At the a gate on the Westerbolwerk and Academiestraat 16. 
- Freising, Germany, SPQF, above the door of the town hall.
- Ghent, Belgium, SPQG on the Opera, Theater and some other major buildings. In 1583, during the Dutch Revolt, Ghent struck coins with a shield inscribed SPQG.
- Hamburg, Germany, SPQH on a door in the Hamburg Rathaus
- Hanover, Germany
- Haarlem, the Netherlands, SPQH on the face of the town hall at the "Grote Markt"
- Hasselt, Belgium, SPQH
- Kortrijk, Belgium, SPQC, city hall
- Lazio, Italy, SPQS, coat of arms and flag (the second "S" stands for "Sabinus", referring to the Sabines)
- Leeuwarden, Netherlands, SPQL on the mayor's chain of office
- Liverpool, England, SPQL on various gold doors in St George's Hall
- City of London, England, SPQL
- Lübeck, Germany, SPQL on the Holstentor
- Lucerne, Switzerland
- Milan, Italy, The Holy Roman Emperor Charles V struck coins at Milan with the inscription S P Q MEDIOL OPTIMO PRINCIPI.
- Modica, Italy, SPQM is on the coat of arms
- Molfetta, Italy, SPQM is on the coat of arms
- Naples, Italy, Coins struck during Masaniello’s 1647 revolt showed a shield inscribed SPQN.
- Nuremberg, Germany, SPQN ("Norimbergensis") on the Fleisch Bridge (one of the major bridges over river Pegnitz in the inner city)
- Oudenburg, Belgium, SPQO (Senatus Populusque Odenburgensis) on its water pump next to the market square. 
- Olomouc, Czech Republic, SPQO on its coat of arms
- Palermo, Italy, SPQP
- Penne, Abruzzo, Italy, SPQP
- Rotterdam, the Netherlands, SPQR on a wallpainting in the Rotterdam City Hall
- Siena, Italy, SPQS
- Solothurn, Switzerland, SPQS on the Cathedral of St Ursus and Victor
- Terracina, Italy, SPQT
- Tivoli, Lazio, Italy, SPQT
- Valencia, Spain, SPQV in several places and buildings, including the Silk Exchange and the University of Valencia Historic Building.
- Verviers, Belgium, SPQV on the Grand Theatre
- Vienna, Austria
In the early twentieth century, the letters "SPQR" could sometimes be seen displayed on London market traders' stalls, meaning "Small Profits, Quick Returns".
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 cover of the Spanish Mort & Phil comic album La historia del dinero, Mort is carried on a litter as a Roman emperor, while his partner Phil holds a Roman standard topped by an umbrella with the tituli SPOR and SI LLUEVE (a pun, since Es por si llueve means "Just in case it rains" in Spanish).
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.
In the internet meme Polandball, the Roman Empire is represented by SPQRball.
The inscription in the Arch of Titus
Manhole cover in Rome with SPQR inscription
SPQR of in the coat of arms of Reggio Emilia
Arch of Septimius Severus top inscription
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- Cover of Français Pour Une Nuit - Live Aux Arènes De Nîmes 2009 at Discogs
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