Claim: Classical-era Europe provides evidence of two major migration movements: the Celtic peoples (a collection of Indo-European peoples in parts of Europe and Anatolia), and the later Migration Period from the North and East; both may be examples of general cultural change sparked by primarily elite and warrior migration.
Evidence: Classical-era Europe provides evidence of two major migration movements: the  Celtic peoples in the first millennium BC, and the later Migration Period of the first millennium AD from the North and East. The Celts (/kɛlts, sɛlts/, see pronunciation of Celt for different usages) 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. Both may be examples of general cultural change sparked by primarily elite and warrior migration.