Classical Latin is the form of Latin that was used by the Ancient Romans in official Roman record-keeping, the Roman army, and Latin literature. Its use helped the Golden Age of Latin literature, during the 1st century BC and the early 1st century AD.
Classical Latin is a dead language, as is Vulgar Latin, the common speech of citizens in the Roman Empire. Latin is no longer spoken as a first language, but it is still spoken by church officials in the Vatican, where it is the official language.
