Duke of Opole and other Silesian duchies
Jan II the Good was Duke of Opole-Brzeg -Strzelce-Niemodlin in 1476, ruler over Gliwice, Toszek, Niemodlin, Bytom, Koźle, and Racibórz. He belonged to the Silesian branch of the Polish Piast dynasty which was the oldest branch of the first Polish royal dynasty.
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