The Osi were an ancient tribe dwelling beyond the Quadi in a woody and mountainous country bordering the Celtic Boii, Daci and numerous Germanic tribes - this region equites to modern Poland, Slovakia, Hungary and Ukraine. Tacitus records these people as speaking Pannonian and Gallic tongues - they are believed to have originated in Celtic lands to the west and migrated to this region in order to farm and mine iron. Cut off from the Celtic world they were forced to pay tribute to the Germanic tribes in the area. During the campaigns of Marcus Aurelius against the Marcomanni, the Osi resettled to southern Pannonia. Eventually records of the Osi disappear as they are thought to have merged into the Suevi population who had by 250 AD formed a vast confederation in the broader region.

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