Definitions for "Prussia"
a former kingdom in north-central Europe including present-day northern Germany and northern Poland; "in the 19th century Prussia led the economic and political unification of the German states"
Prussia is a region located at the south eastern coast of the Baltic sea. It was originally settled by the Old Prussians, a Baltic people. In the 13th century this "Old Prussia" was conquered by the Teutonic Knights at the request of Konrad I of Masovia.
Prussia (; Latin: Borussia, Prutenia; ; ; ; Old Prussian: Prūsa) was, most recently, a historic state originating in Brandenburg, an area which for centuries had substantial influence on German and European history. The last capital of Prussia was Berlin.