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What did the Roman slogan SPQR mean?

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The Roman slogan SPQR is an abbreviation for the Latin phrase senatus populusque Romanus, which translates to "the Senate and the people of Rome".12

This acronym served as a powerful symbol of the Roman state, representing the collaborative political structure of the Roman Republic. It signified the alliance between the aristocracy—embodied by the Senate—and the common citizens, reflecting a system where power was shared among the people, the aristocracy, and the consuls.2

The letters were frequently displayed on the city's public buildings and military standards, acting as a testament to the unity and patriotism of the Roman state during its rise to power in the Mediterranean.2