In 1336, Jan was forced to accept the annexation of the Duchy of Racibórz to the Přemyslid Duchy of Opawa.
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On 24 February 1327, together with the other Piast Dukes, Jan paid homage to King John of Bohemia in Opawa.
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Even after he left his Church career, Jan continued to receive the revenues generated from his former title of Scholastic in Krakow, which caused the intervention of Pope Gregory XI: Jan was forced to pay 5,000 fines and 500 florins as compensation for damages.
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