Celtic languages, subfamily of the Indo-European family of languages. At one time, during the Hellenistic period, Celtic speech extended all the way from Britain and the Iberian Peninsula in the west across Europe to Asia Minor in the east, where a district still known as Galatia recalls the former presence there of Celtic-speaking Gauls. Later, however, in the course of the Roman conquest, Celtic speech tended to yield to Latin, and by the 5th cent. a.d. Celtic had virtually disappeared from continental Europe. Today the Celtic languages that have survived into the modern era are limited almost entirely to the British Isles and French Brittany, where these tongues are spoken by a total of about 2 million people. The Celtic subfamily is made up of three groups of languages: the Continental, the Brythonic (also called British), and the Goidelic (also called Gaelic).
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