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>The original settlers tended to name their assets after surrounding localities (streams, lakes, seas, forests, etc.). The clan or tribal entity into which their descendants later were organized continued to use the names. This source is perhaps the one used in the very name of Prusa (Prussia), for which an earlier Latin-language word Bruzi is found in the Bavarian Geographer. In Tacitus' Germania, the Lugii Buri are mentioned living within the eastern range of the Germans. Lugi may descend from Pokorny's *leug- (transl.black swamp), while Buri is perhaps the root on which the toponym 'Prussia' is based
>In the second century AD, the geographer Claudius Ptolemy listed some Borusci living in European Sarmatia (in his Eighth Map of Europe), which was separated from Germania by the Vistula Flumen. His map is very confusing in that region, but the Borusci seem further east than the Prussians, which would have been under the Gythones (Goths) at the mouth of the Vistula. The Aesti recorded by Tacitus, were 450 years later recorded by Jordanes as part of the Gothic Empire
>The original Old Prussian settlement area in the western Baltics, as well as that of the eastern Balts, was much larger than in historical times. The archaeological documentation and associated finds confirm uninterrupted presence from the Iron Age (fifth century BC) to the successive conquest by Slavic tribes, beginning in the Migration Period