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About 1269 the Duchy of Opava was established on adjacent Moravian territory, ruled by the Přemyslid duke Nicholas I, whose descendants inherited the Duchy of Racibórz in 1336.
In 1451, William transferred his ownership of Münsterberg to his brother Ernest, in exchange for a 1/3 share in the ownership of the Duchy of Opava.
Nicholas retained the Duchy of Opava after the last Přemyslid ruler of Bohemia, King Wenceslaus III was killed in 1306.