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Which Continental Celtic language was once dominant in Gaul?
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Celtic languages
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The Continental Celtic language that was once dominant in Gaul is the Gaulish language.
Gaulish was an ancient Celtic language spoken across western and central Europe, as well as parts of Asia Minor, before approximately 500 CE. It is categorized as a Continental Celtic language, a group that includes the languages spoken by peoples identified by classical writers as Keltoi and Galatae. While knowledge of Gaulish is limited due to the nature of the surviving evidence—which consists primarily of names recorded by Greek and Latin writers and a small number of inscriptions found in France and northern Italy—it was the primary language of the region prior to the Roman conquest and the subsequent imposition of Latin.123