Part of the Holy Roman Empire (since 1600s: "...of the German Nation")
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A map of Royal and Ducal Prussia around 1575, made by Halibutt in GIMP, based on an [http://upload.wikimedia.org/wikipedia/en/archive/c/cb/20041019104150%21Royal_Ducal.png earlier GFDL map] by w:User:Space Cadet and Halibutt's "Rzeczpospolita" map se