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In page Slavs:

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West Slavs originate from early Slavic tribes which settled in Central Europe after the East Germanic tribes had left this area during the migration period.[1] They are noted as having mixed with Germanics, Hungarians, Celts (particularly the Boii), Old Prussians, and the Pannonian Avars.[2] The West Slavs came under the influence of the Western Roman Empire (Latin) and of the Catholic Church.[citation needed]