Duchy of Bytom
…The Duchy of Bytom (Polish: Księstwo Bytomskie, Czech: Bytomské knížectví, German: Herzogtum Beuthen) was a duchy in Upper Silesia, one of the Silesian duchies of fragmented Piast-ruled Poland. It was established in Upper Silesia about 1281 during the division of the Duchy of Opole and Racibórz among the sons…