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In page Celts:

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All living Celtic languages today belong to the Insular Celtic languages, derived from the Celtic languages spoken in Iron Age Britain and Ireland.[1] They separated into a Goidelic and a Brittonic branch early on. By the time of the Roman conquest of Britain in the 1st century AD, the Insular Celts were made up of the Celtic Britons, the Gaels (or Scoti), and the Picts (or Caledonians).[citation needed] The renown of insular Celts has caused a popular belief that Celtic clans only lived in the British Isles.[2]