The Celts are a collection of Indo-European peoples in parts of Europe and Anatolia identified by their use of the Celtic languages and other cultural similarities. Historic Celtic groups included the Gauls, Celtiberians, Gallaecians, Galatians, Britons, Gaels, and their offshoots. The relationship between ethnicity, language and culture in the Celtic world is unclear and controversial. In particular, there is dispute over the ways in which the Iron Age inhabitants of Britain and Ireland should be regarded as Celts.
