Latin is an Italic language historically spoken in Latium and Ancient Rome. Through the Roman conquest, Latin spread throughout the Mediterranean and a large part of Europe. Romance languages such as Italian, French, Catalan, Romanian, Spanish, and Portuguese are descended from Latin, while many others, especially European languages, including English, have inherited and acquired much of their vocabulary from Latin. It was the international language of science and scholarship in central and Western Europe until the 17th century, and then it was gradually replaced by vernacular languages, especially French, which became the new lingua franca of Europe. There are two main varieties of Latin: Classical Latin, the literary dialect used in poetry and prose, and Vulgar Latin, the form of the language spoken by ordinary people. Vulgar Latin was preserved as a spoken language in much of Europe after the decline of the Roman Empire and by the 9th century diverged into the various Romance languages. After the fall of the Western Roman Empire, Latin survived as the lingua franca of educated classes in the West, and this survival was reinforced by the adoption of Latin by the Catholic Church. In this milieu, it survived as a mother tongue at least into the second millennium A.D. and is referred to as Medieval Latin. The Renaissance briefly reinforced the position of Latin as a spoken language, through its adoption by the Renaissance Humanists. After the 16th century, the popularity of Medieval Latin began to decline, although it remained in use for academic discourse and publication until the 18th century.

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