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Yotvingia was a Prussian region, then subordinate to Kievan Rus (since 983), that intersected the borders of what was then Prussia, Kievan Rus and the Duchy of Lithuania.
Ivan Duridanov has claimed that the river names Arsio, Arse in Old Prussia, Arsen and Arsia in Latvia and Arsina in Germany are derivation of the root ors-, ers “(for water) flow, damp” in the Indo-European language family (Hindi arşati) and ars- in the Thracian language.