Classical language popularized through the Roman Empire; widely used in scholarship and Roman Catholicism.
Latin is a classical language that became dominant through the power of the Roman Empire. It continued to be used through the medieval period and served as a language of international communication and scholarship into the 18th century. The colloquial form, Vulgar Latin, is the root of the Romance languages, like Spanish and French.
Ecclesiastical Latin continues to be used in Roman Catholicism.