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Duchy of Żagań → Duchy of Sagan — According to WP:NCGN the widely accepted historical English name should be used, and the name should reflect cultural or political dominance. The cultural and political dominance was German, since the local society was Germanized during the Ostsiedlung in the 13th and 14th century and the duchy belonged to several German and Bohemian overlords. Google Books, restricted to English, gives these results: