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In page Rome:

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Rome has also been called in ancient times simply "Urbs" (central city),[1] from urbs roma, or identified with its ancient Roman initialism of SPQR, the symbol of Rome's constituted republican government. In 192, emperor Commodus renamed the city Colonia Lucia Annia Commodiana after himself, but the name was reverted to Rome after his assassination at the end of the year.[citation needed] Furthermore, Rome has been called Urbs Aeterna (The Eternal City), Caput Mundi (The Capital of the world), Throne of St. Peter and Roma Capitale.